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?
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सही उत्तर: (D) 25
Let brown pairs=x, price of brown pair=p. Original bill=15p+xp, Wrong bill=5p+3xp. Given: 5p+3xp=2(15p+xp). Solving: x=25.
In English (Question & Model Answer)
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?
Correct Option: (D) 25
Let brown pairs=x, price of brown pair=p. Original bill=15p+xp, Wrong bill=5p+3xp. Given: 5p+3xp=2(15p+xp). Solving: x=25.