Aptitude Question ID: 105992
How many men need to be employed to complete a job in 5 days. If 15 men can complete $latex \frac{1}{3}&s=1$ of the job in 7 days?
[A]20 days
[B]21 days
[C]45 days
[D]63 days
63 days
15 men complete $latex \frac{1}{3}&s=1$ work in 7 days.
∴ Time taken in doing 1 work = 3 $latex \times$ 7 = 21 days
$latex \therefore M_{1}D_{1} = M_{2}D_{2}$
$latex => 15\times 21 = M_{2}\times 5$
$latex => M_{2} = \frac{15\times 21}{5} = 63\ days&s=1$
Hence option [D] is correct answer.