A can do a certain job in 14 days. B is 40% more efficient than A. In how many days does B alone take to do the same job ?
a) 13 b) 12 c) 11 d) 10 e) 9
Answers and Explanations are welcome in comments
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Answer and Explanation of Question No. 25
ReplyDeleteCorrect Answer is 10
Explanation : B is 40% more efficient than A So Ratio of their efficiency is 100:140 i.e. 5 : 7 (Ratio of Days is reciprocal of Ratio of efficiency)
So, the ratio of Days is 7:5
That means A can do the work in 7x days and B can do it in 5x
It is given A can do the work in 14 Days. So 7x = 14, x = 2
So B will do it in 5x = 5*2 = 10 Days