Question

If 28 men working 6 hours a day can finish a work in 15 days. in how many days can 21 men working 8 hours per day will finish the same work

Answer 1

Hey.

Here is your answer.

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As a work is done by 28 men in 15 days at the rate of 6hr per day
or, 28 men take 15×6 hr to finish the work.
or, 28 men take 90 hr to finish the work .
or, 1 men will take 90×28 hr to finish 1 work.
or, amount of work done by 1 men in 1 hr = 1/2520 work

no. of days =2520/21×8=2520/168= 15 days.

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Thanks