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
A

`10`

B

`15`

C

`20`

D

`25`

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