I don't mind how tricky this question is, but i am concerned about the weightage of this question. For a merely 4 marks, if I can't solve it at 1st glance, I will skip it. We call this efficiency.
@ndamugobaivan1
3 жыл бұрын
Very useful for sure. Our children will have somewhere to get help. Dear everyone, this channel is worth visiting now and then.
@PracticleMath
3 жыл бұрын
Thanks, Ivan! So nice of you to say that! We are happy to know that we can help more children ! =D
@randomquestions3470
2 жыл бұрын
Lets make it viral
@9eternal
2 жыл бұрын
holy ivan from the question!
@o0o0o60
3 жыл бұрын
Seems like a good word problem for quadratic equations in secondary 3
@PracticleMath
3 жыл бұрын
I wonder if this will be too easy peasy for sec 3 ^^"
@MrPorkered
2 жыл бұрын
Actually the hard questions are not that hard if they learn how to be tidy and arrange neatly like your table =)
@PracticleMath
2 жыл бұрын
Yes yes, but kids being kids, as long as they can see the logic good enough already. Doesn't matter what method they use XD
@eduardoxmenezes
2 жыл бұрын
Hello, thx for the explanation. However, would you tell me why the information of 108g that you've taken from 40 50c coins is obtainable? I mean, we don't know yet how much does the 20c coin weigh. It just said that 50c's weigh is more than 20c; therefore I'm still confused on why we could get that 108g. Was it omitted / exemplified by 1unit bcs it doesn't matter? EDIT: it's on 5:28 & 6:12 but still I don't get it, since I believe that 2.7g should interact with the actual weight of a 20c's. EDIT 2 : Aha! I'd like to propose my way of answering. On Q(b), perhaps we should start by imagining that each of a 50c & a 20c coins weigh the same. If those weighed the same, then, the statement of HELEN's ~ (SomeWeight)g + (40 * 50c)g = 1134g and IVAN 's~ (SomeWeight)g + (40 * 20c)g = ?g is practically impossible to solve (or simply Ivan's coin should also be 1134g). Therefore we must accept that 50c's and 20c's weighs are different. Now, because the information of 20c's weight that interacts with the 50c's is provided, the (SomeWeight)gram does not only tell about SomeUnit of 50c and 64 of 20c (which identical for Helen & Ivan), but also *absorbing* the information about what we can translate from "50c coin is heavier " idea, which lies an equivalence when Helen and Ivan compare their coins on the remaining weight difference even though Helen uses 50c and Ivan uses 20c. So, yeah, no matter how much Ivan's coin weighs, Helen will always has that 2.7g difference. Which in conclusion we can use one unit of coin as an example to look for the difference. Above all, I think, if only the kids were provided information that Ivan's total coin's weight is different than Helen's, it would be easier to digest. I definitely would give this as a hint.
@sharoncheong2028
2 жыл бұрын
when we take psle we look at the running time. every second the clock ticks , our heartbeat will increase then we'll forget the solution. as you forget it, u will get even anxious and at last u will not complete and will pull yr marks down. i am taking psle this year and i hope i will be able to cope with it. god bless me
@PracticleMath
2 жыл бұрын
Hi Sharon, we can understand the anxiety that kids are facing during the exam, but hey, practice makes perfect! We're sure you'll be able to do a good job, just do your best and don't worry about the things that you can't control! 💪
@meiko_shi2839
2 жыл бұрын
Heyyy sharon.. I also taking the PSLE paper this year. I know it's rushing as the P6 year is very fast but you and I can progress till the end! I hope that we can at least get some method marks in some hard questions. If you're reallllly that anxious, try to manage your time. Balance your study time with your gaming time if u have.
@lynfartsallday
3 жыл бұрын
I'm P5 this year and i could solve this by my own. but I'm scared that next year the paper would be harder. anyways gl to yall P6's! I hope you do well. you hv my well wishes from me! like i said, gl :)
@PracticleMath
3 жыл бұрын
Good for you, Lyn! It's so kind of you to cheer the P6s on this year! =D
@alpha_rushlord3934
2 жыл бұрын
Won't one will be easier. I know this cuz 2019 was the hardest psle my elder brother told me
@AhiruTV
2 жыл бұрын
good luck for your psle paper! don't be stressed, im with you XD taking my psle math tmr!
@AhiruTV
2 жыл бұрын
@lin zixuan what sch r ufrom?
@mvddi3678
3 жыл бұрын
I like how the some of the people here said they can solve it and say they're P5, P3, etc, yet imagine the stress you would be and the limited time you would have to do this.. Ay, hello, the first thing I thought was who in heavens calculates their coin's weight- After the examination, I understood how to do it but it's because I had LIMITLESS time, compared to in examinations, I would be flattened to death on what method to use, why this came out, why there is so less information, etc. PLEASEEEE- understand the majority of students taking PSLE don't have that calm attitude and solve this in such a breeze- my class, which is a top class, had some of the student crying over the paper's difficulty, and the fact I didn't solve 10+ questions got me a trip to probably AL 6/7 or even worse, retaining- 💀 I know I'm a bit pressed over this but GOD, I was so stressed over the examinations and my classmates felt the same pain, please give us a break- good for you if you understand how to solve it and all but I can't and so do some others- 💀💀
@PracticleMath
3 жыл бұрын
Yes Peace! I totally agree with you. It's easy to give comments when you are not in the situation yourself, I think the world just need a little bit more empathy at times.
@mvddi3678
3 жыл бұрын
@@PracticleMath I'm so glad that you empathize with us, P6s, who can't finish it- it really stresses some people at first glance, but after some thought, the realization will kick in- thank you for agreeing, it really made my day after being so under-pressure over this question. 🥺
@KiNg-qo4zl
2 жыл бұрын
isn't the paper like very long (2h 30min combined?) maybe its the stress ngl i feel it :/
@riosthaha8715
2 жыл бұрын
@@KiNg-qo4zl yea but sometimes when we get stuck at a question we end up spending 5 to 10 minutes on it and have no more time to finish the rest of the questions
@idkzkokk
3 жыл бұрын
who ever did this qn and got it wrong pleaee dont be discouraged. 😖 1st. you wont ever use this in life 2nd. As a secondary sch student (who is also taking olvls this yr) it also took me a while to do Let the past be the past, dont feel bad because you got it wrong, just learn and thats how you get to greater heights in life. 😄 STAY STRONG and gl for the other psle exams
@PracticleMath
3 жыл бұрын
That's great advice! ^^ Yes, now that you guys know the answer, at least you know how to do it. Life is more than just points and marks!
@amathescreaming
3 жыл бұрын
Thank you!
@lsg5200
2 жыл бұрын
I'm a university graduate and it took me more than 2 hours to solve this. Although i got them right, many things look complex when you try to solve it using tertiary level method. For primary school, you really need to arrange things in a simple way, so that you can compare the units easily. Using quadratic equation can end up with too many unknowns, and the objective is not to find out how many coins each of them have, nor the total value of each of them. I guess this is also a reason why many parents (or adults) struggle to solve this too.
@vihaanveerdewangan6
Жыл бұрын
interesting!
@baxingggg
11 ай бұрын
Yea as we age we get expose to more different ways of learning till we despise the basics of doing things as we want to achieve more yk yk. I can feel that too. I was one of the p6 students who got that question for psle I surprisingly got it all correct by doing graph it made me saw the 1 unit thing.
@dhruvkumra5533
3 жыл бұрын
Let’s go I got it right! Luckily math is my strong subject so I think I did well and can get above 90 (al1)
@SilentKiller-jh7in
3 жыл бұрын
Shush nerd
@dhruvkumra5533
3 жыл бұрын
no
@callumtan5907
3 жыл бұрын
lmao nice job
@dhruvkumra5533
3 жыл бұрын
@@callumtan5907 thanks gl to u
@PracticleMath
3 жыл бұрын
Well done!
@questionable3789
3 жыл бұрын
Somehow whenever I see a hard question somewhere in the middle of the paper,I cant focus doing the other questions anymore.
@PracticleMath
3 жыл бұрын
I get what you mean...maybe u can try to skip the hard ones first and not think about them for the time being. The trick is to stay positive and focus on the ones you know. The same rule applies to whatever you are doing! All the best for the rest of the papers, Rainbow!
@questionable3789
3 жыл бұрын
@@PracticleMath idk if Im just suffering from anxiety and thinking about the exact same question when Im on the other questions. Seriously this feels like gaokao for P6s bruhh
@ipadcoconut4707
3 жыл бұрын
My teacher says that is a trick actually, she told us they wouldn’t always put the hard one at the back because it has become a stereotype so that way, the hard one is worth less mark but uses up your brain power before you get to those at the end :)
@questionable3789
3 жыл бұрын
@@ipadcoconut4707 but I think that question worthed 5 marks for 1 question.
@ipadcoconut4707
3 жыл бұрын
@@questionable3789u mean this question? In the video? That is worth four marks, part a is 2 marks and b is 2 marks but part a was split into two sections so not sure if they each have marks or smth
@code6868
3 жыл бұрын
The main hint is that their number of coins are equal. The difference in the total value of their coins occurs in the “gap” between Helen’s 64 20cent coins and Ivan’s 104 20cent coins where Helen has 40 50 cent coins and Ivan has 40 20cent coins. All the other coins outside this gap cancel out in terms of value and thus this difference in value = total difference in value=. (50c-20c)x40=$12 With reference to the gap identified in part (a), all other coins “cancel each other out” in terms of mass. Hence total difference in mass= difference in mass between the 40 50cent coins and the 40 20cent coins=2.7x40=108g=0.108kg. Mass of Ivan’s coins = 1.134kg-0.108kg=1.026kg
@eduardoxmenezes
2 жыл бұрын
aha i see the point here thx
@sherlinjenelia9246
3 жыл бұрын
For the last part in your (b) answer, you put 1.026g instead of kg.
@PracticleMath
3 жыл бұрын
Thanks for pointing that out, Sherlin! =) Yes, that should be in kg.
@yjbs2217
3 жыл бұрын
i feel so bad for you man. tbh this exam is indeed challenging but i got correct xD ( not flexing) but anyways GL.
@nurhusnamasnizamfsps228
Ай бұрын
HELLOOO thx for the answers! I get what you thought me at part a, but i dont know abt part b... cuz how can the 50c coins be 2.7g? And how did you get 108g? I rlly dont understand so please help me as I am taking my preliminary examination (math) on monday... Im gonna be so scared if you dont reply fast enough.. Please explain
@yjbs2217
3 жыл бұрын
the only weakness i have in paper 1 and 2 is careless mistakes. HAHA
@PracticleMath
3 жыл бұрын
^^" Is that good or bad? Haha....
@pomegranate_boba
3 жыл бұрын
Same! careless mistakes are killing me
@hellothere6554
3 жыл бұрын
same here. i kept telling myself excusses that my brain was just not awake yet to not demotivate me for my upcoming papers. good luck for you science psle coz it isnt gonna be easy ( i sense )
@issacquek9839
3 жыл бұрын
Will u get 1 mark if u put only helen
@ignxtius1683
3 жыл бұрын
Pfffttt
@ignxtius1683
3 жыл бұрын
If (a) is 1 mark then yes , if not then no
@vivien9085
3 жыл бұрын
Just saw a squid game joke and the challenge was this question, printed on the sweet thingie😂😂😂😂
@PracticleMath
3 жыл бұрын
^^" Haha...
@vivien9085
3 жыл бұрын
@@PracticleMath Haha
@unitedcuber3197
3 жыл бұрын
Honestly for part a, I just assumed helens 50 cent coins was 104 and 20 cent coins were 64 while Ivan’s 50 cent coins is 64 and 20 cent coins are 104 so they both add up
@PracticleMath
3 жыл бұрын
That's actually very good if you can see that from the start!
@renhaoheng8029
Жыл бұрын
how is that assumption accurate? i don't understand.
@shaneethan523
Жыл бұрын
@@renhaoheng8029 Both Ivan and Helan has the same no. of coins.
@kehloveclock
Жыл бұрын
My method is the replace 40of Helen’s 50 cent coins into 20cent coins to get ivan
@darkenity882
Ай бұрын
I think this question is the reason why MOE made the PSLE easier.
@hellothere6554
3 жыл бұрын
I got it correct, my method was i assume the amount of coins that they have, 150 since both had the same amount. Now when you take 50-20 cent, you will always get 30 cent left, hence any amount you put example 200 you will still get the same answer. This question is challenging but i managed to solve a within a short period of time but got stuck at b for a moment. I think this question test us on our understand of value especially coins as which ever 50 cent u subtract with 20 you will still get the same answer
@PracticleMath
3 жыл бұрын
Good for you!
@belajarbahasaarab500
Жыл бұрын
Why multiply by 40 cent coins with 50 in helen
@helloleho-o8l
2 ай бұрын
tysm this rlly helped:)
@Valyirxz
2 жыл бұрын
How did I get question (A) wrong and question (b) correct.
@joycechia655
3 жыл бұрын
So lucky i wasnt born 1 year later
@PracticleMath
3 жыл бұрын
Haha....and the bonus is, you can now use Algebra to solve this! XD
@greengiraffe1709
3 жыл бұрын
I am P3 this year and could solve it on my own.
@PracticleMath
3 жыл бұрын
Yayy!! Great job, Nathan! =D
@erlenekohenkcs5138
2 жыл бұрын
Hi i don't understand why you multiply 2.7g and 40
@odaividoprodude1462
2 жыл бұрын
hi can help me with 2021 paper 2 question 14
@itz_me0356
3 жыл бұрын
I only do 40x2.7 for part b cuz I didn’t have much time. But do you think I’ll get a method mark?
@PracticleMath
3 жыл бұрын
That's a valid working! =)
@ipadcoconut4707
3 жыл бұрын
Hmm that question was two marks so if there was method mark… it would be one mark not sure if they will decide the method mark to the two equations tho, or is it only if you did both equations if they do you’ll probably get 1/5 but don’t worry I didn’t even do the question because no time
@PracticleMath
3 жыл бұрын
@@ipadcoconut4707 Well, it's a bit wasted, but looking on the bright side, there's always hope to do better on the next paper! =) All the best, coconut!
@ipadcoconut4707
3 жыл бұрын
@@PracticleMath thanks. A coconut is always harder than the paper :)
@PracticleMath
3 жыл бұрын
@@ipadcoconut4707 Lol! I love that statement of yours! The coconut conquers all! KO! XD
@younu8839
2 жыл бұрын
we can solve it easily with algebra right nt really that hard
@ahduiiiiiiiii
2 жыл бұрын
Can I just sub the total number of coin as 105 that just do a bit of calculation
@cosmocrite9283
3 жыл бұрын
I finally feel peace
@PracticleMath
3 жыл бұрын
Haha...*ohm*
@yjbs2217
3 жыл бұрын
dont forget mother tongue and science (higher mother tongue if have)
@x_gaming3012
3 жыл бұрын
4:52 it is ok since you explain,or maybe its affected cause im p5
@jiayin8842
2 жыл бұрын
My paper was the 2019 math paper, I do until I wanna cry. This paper looks easier(not saying that it is) but I think 2019 was the hardest
@et-ms3nh
3 жыл бұрын
Wow at least I got the who had more money part right. Thanks for making this video!
@PracticleMath
3 жыл бұрын
Our pleasure! =)
@madhusingumsetty8982
3 жыл бұрын
Yippee I got it correct
@PracticleMath
3 жыл бұрын
Yayyy!!!
@randomlyawesum5100
3 жыл бұрын
Bruh im legit relooking at my mistakes right now (i got this question correct by the way) and i thought about the math exam. This question took me a long 20 minutes to solve like my brain was malfunctioning LOL. Luckily i manage to finish the paper in the nick of time. I freaked out at the end LOOL. 4 October 2021- good luck for your Science! •♡•
@PracticleMath
3 жыл бұрын
Yup, we've all been through it! The question looks much easier now without the stress, right? ;p
@randomlyawesum5100
3 жыл бұрын
@@PracticleMath Yes, WAYYYYY better
@randomlyawesum5100
3 жыл бұрын
@@PracticleMath But now im stressed about the ones i got wrong. I feel guilty thinking about them
@mamaseasycooking479
2 жыл бұрын
a) Easy b) Over- insane
@emstut
3 жыл бұрын
A similar question to the Helen and Ivan question had come out in a previous PSLE paper and there was no fanfare then.....
@pomegranate_boba
3 жыл бұрын
really?
@emstut
3 жыл бұрын
@@pomegranate_boba Yes, in 2015
@bangxingho3408
2 жыл бұрын
I did some quick calculations and figured out the time spent on doing this question wasn't worth the marks😅
@eiman2498
Жыл бұрын
4:53 I found it easy :D
@Coco-rf4hd
3 жыл бұрын
I got it right!
@PracticleMath
3 жыл бұрын
Great to hear that!
@estherho9453
3 жыл бұрын
A lot of time used to calculate this question.
@PracticleMath
3 жыл бұрын
^^"
@slxkunyu2575
3 жыл бұрын
LET GO I GOT IT RIGHT
@ezhilsrirambowenss7306
2 жыл бұрын
i used logic for part a and got it right yay
@ansonzheng650
3 жыл бұрын
I actually am p6 and i also did this question but i used ratio and thats all
@PracticleMath
3 жыл бұрын
Great!
@vantablack8258
3 жыл бұрын
bro this years paper is so hard
@cleatrix1761
3 жыл бұрын
Yep but paper 1 was easy(ik it's always expect but it was extremely excited for me so don't judge me)
@vantablack8258
3 жыл бұрын
yeah paper 1 was ez
@Stryke988
3 жыл бұрын
nah its easy bro
@yoonloywong1864
3 жыл бұрын
yeah it was hard for me too...
@yjbs2217
3 жыл бұрын
every year people say "this year hardest" o'comon to me is not hard (just my opinion tho)
@ryanxue5622
2 жыл бұрын
Now i know who are these helen and ivan ..
@kweksixian9715
3 жыл бұрын
I had my PSLE last year,I got a B but I can’t solve this good luck p6 students
@alpha_rushlord3934
2 жыл бұрын
Eh same last year psle i get b also
@rajisybiraji7228
3 жыл бұрын
I remember this question it was so hard and there was no more time for me to do it so I just guessed the name only and I was about to put Ivan but I put Helen so I hope I get atleast 1 mark for that
@pramathnarev6412
3 жыл бұрын
i didnt even bother to try b thinking it was hard. Realizations keep telling me" STUPID!!"
@celxy
3 жыл бұрын
Lol i wasn’t even able to do a but yes b is stupid
@PracticleMath
3 жыл бұрын
Yah...the question in part b is a bit weird. Well, but looking on the bright side, at least you got part a, right? =)
@ipadcoconut4707
3 жыл бұрын
My friend skipped the last part of every big question somehow. As long as the question was splitter into a b or a b c she left the last one blank. If it were a a b question she would skip the b.
@baxingggg
11 ай бұрын
As a person who took the 2021 psle it was a piece of cake to me. To be honest i feel that as we grow and learn new things, we get exposed to different ways and shortcuts to do things. However as we overdo it, we may think that the basic is within us or too simple to be often used and may be thrown away. As implied onto this question i think, some older people would have struggled doing this because they are not thinking simply. And the logic just goes on, my english is do bad lol
@Walker88801
2 жыл бұрын
nice
@ipadcoconut4707
3 жыл бұрын
Then they went coffee shop and changed them into cash the end
@myatthinzarhtoo14
3 ай бұрын
I thought I'd take like an hour to do it but I took like 20 minutes or so
@KiNg-qo4zl
2 жыл бұрын
very concise explanation but i prefer using algebra :/
@boom2078
3 жыл бұрын
I put $21-
@randomlyawesum5100
3 жыл бұрын
.... So close yet so far
@amasopm
3 жыл бұрын
Wow good question to use on business to cheat partner as 50cent to $1000 notes & 20cent to $10 notes & Helen will get more $$$.. As question said both have 50cent coins but the end Ivan only have 1 unit... hahhaha...
@PracticleMath
3 жыл бұрын
Haha...now everyone knows why it's so important to learn Math!
@jaerin3650
3 жыл бұрын
i got it wrong :( hopefully my other questions have M1 at least so that i can get a few more marks
@PracticleMath
3 жыл бұрын
It's ok Jae, you still have the other questions. =)
@yamkam_
3 жыл бұрын
I took this years math psle paper and SHEESH, I almost died XD especially this question (btw english paper was ez)
@PracticleMath
3 жыл бұрын
One easy one hard, 2 more to go!! All the best!
@DingleberryGaming56
3 жыл бұрын
everyone being distress but somehow i am not
@yamkam_
3 жыл бұрын
@@PracticleMath Thanks all the best to you too!
@ignxtius1683
3 жыл бұрын
Was this the last question of the paper?
@DingleberryGaming56
3 жыл бұрын
@@ignxtius1683 no
@sureshdumithra6948
3 жыл бұрын
what i can all say get lost question but at least I gotta point but get lost maths I being offended by seeing this question
@LEGIRLSROCK
3 жыл бұрын
I put the wrong units cool
@yjbs2217
3 жыл бұрын
...
@PracticleMath
3 жыл бұрын
At least you got most of it right! ;p
@Ex1lpse
2 жыл бұрын
I somehow got this question correct
@motvational
2 жыл бұрын
=hard
@JiEN0011
3 жыл бұрын
It is easy, I got it right
@PracticleMath
3 жыл бұрын
Well done! =)
@pomegranate_boba
3 жыл бұрын
easy?!
@JiEN0011
3 жыл бұрын
@@pomegranate_boba the fact is some will find it easy, some will find it hard. It is different perspective.
@randomlyawesum5100
3 жыл бұрын
@@pomegranate_boba lol ikr
@changliu2418
Жыл бұрын
IT WAS SO EASY-I AM SMART]
@PracticleMath
Жыл бұрын
Good for u! =)
@benjiuchiha5549
2 жыл бұрын
imagine leak
@SenthilKumar-xu1kl
3 жыл бұрын
Ah yes peace
@PracticleMath
3 жыл бұрын
High five!
@myatthinzarhtoo14
3 ай бұрын
Not too hard. More or less manageable
@kemizhang8668
3 жыл бұрын
I can solve it easily only if I'm allow to use algebraic equations. :-(
@PracticleMath
3 жыл бұрын
Are you a P6 student?
@kenmaken078
3 жыл бұрын
WAHOO I GOT IT RIGHT AND I DID IT ON A WHIM
@PracticleMath
3 жыл бұрын
Great job!
@madhusingumsetty8982
3 жыл бұрын
Nice usage of on a whim
@madhusingumsetty8982
3 жыл бұрын
*Psle 2021 English booklet a qn20
@yjbs2217
3 жыл бұрын
@@madhusingumsetty8982 lmao
@randomquestions3470
2 жыл бұрын
I am foundation 😂 and i am deslexic i mean i used to be and i visit this becuz i wanna be a math genius lol i am trying to learn velocity at i just realize it was ez wow
@jasonkoh6357
2 жыл бұрын
its easy
@meekaaarrrzzz
3 жыл бұрын
OMG !!!! To be honest I forgot my answer
@yjbs2217
3 жыл бұрын
HAHA XD!
@pomegranate_boba
3 жыл бұрын
you did?
@meekaaarrrzzz
3 жыл бұрын
@@pomegranate_boba yes i did forgot my answer
@Aoirsae
3 жыл бұрын
i can't do it and I have a PhD omg
@PracticleMath
3 жыл бұрын
^^" Ikr...
@joselynyeo7707
3 жыл бұрын
It is easy, I got it correct.
@PracticleMath
3 жыл бұрын
Well done, Joselyn!
@zilinggoh35
3 жыл бұрын
agree tho :)
@yamkam_
3 жыл бұрын
I got part a right but not part b lol
@Umpire-n3v
3 жыл бұрын
pog i got (b) wrong lmao
@aetheryx5828
3 жыл бұрын
same bro
@AllTime-
3 жыл бұрын
same :(
@rushy2994
3 жыл бұрын
Let's go I got it right as a primary 5 and gl to y'all p6's :)
@PracticleMath
3 жыл бұрын
Good job, Rushy! I'm sure the P6s here will appreciate you cheering them on! =)
@randomlyawesum5100
3 жыл бұрын
@@PracticleMath yes i do, alot.
@jaydenes_
3 жыл бұрын
this paper so hard sia
@PracticleMath
3 жыл бұрын
Yah, it can be quite confusing if you can't see the relationship between the numbers....
@ipadcoconut4707
3 жыл бұрын
Ya lor hor, not an ounce of logic in me by the end. I can say I was completely brain dead like really, I couldn’t even move
@randomlyawesum5100
3 жыл бұрын
I agree leh, dam hard sia. I dying in like 1st 2 papers liao den i thot wa i die liao. But then chinese today was good, i think i can get AL1
@GODBEASTFOOTBALLEDITZ
Жыл бұрын
This question cost me alot . I cant believe how easy it is now that I know the answer. I want to die .
@amlelamly240
2 жыл бұрын
I failed Mathematics then and still can't solve Mathematical problems like this today.
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