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Question

Q1. If 6 men can do a piece of work in 30 hours, in how many hours will 15 men do it?

10 hours

12 hours

35 hours

45 hours

Accepted Answer

Answer : 12 hours

Let the required number of hours be x. Then ,

More men, less hours

(Indirect Proportion)

∴ 15 : 6 :: 30 : x
⇒ 15 × x = 6 × 30
⇒ x = (6 × 30)/15 = 12 hours.

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