If 36 men can do a piece of work in 20 hours, in how many hours will 15 men do it ?
Explanation:
Let the required number of hours be x. Then,
If less men are employed it will take more hours to finish the same task.
Hence, no. of men and time is inversely proportion.
⇒ m1 × t1 = m2 × t2
⇒ (15 × x) = (36 × 20)
⇒ (36 × 20)/15 = 48
∴ 15 men can do it in 48 hours.
Hence, 48.
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