Q25 (2015) A person ordered 5 pairs of black socks and some pairs of brown socks. The price of a black pair was thrice that of a brown pair. While preparing the bill, the bill clerk interchanged the number of black and brown pairs by mistake which increased the bill by 100%. What was the number of pairs of brown socks in the original order ?
(a)10 (b)15 (c)20 (d)25
UPSC Civil Service (Preliminary) 2015 - GS2 - CSAT
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