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A man ordered 4 pairs of black socks and some pairs of brown socks. The price of a pair of black socks is double that of a brown pair. While preparing the bill the clerk interchanged the number of black and brown pairs by mistake which increased the bill by 50% . The ratio of the number of black and brown pairs of socks in the original order was = ?
Options:
A .  2 : 1
B .  1 : 4
C .  1 : 2
D .  4 : 1
Answer: Option B

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