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### Question Asked by a Student from EXXAMM.com Team

** Q 2443445343. ** 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?

**IAS 2015 Prelims **