How many men need to be employed to complete a job in 5 days, if 15 men can complete 1/3 of the job in 7 days?

 a) 20
 b) 25
 c) 45
 d) 63
SSC CHSL-2014

63.

Solution
15 men can complete the work in 21 days.
So work done by one = 1/(21 x 15)
Work completed in 5 days by a man = 5/(21 x 15)
= 1/63
So Number of men needed to complete the work in 5 days is 63.

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