Question

A group of 21 boys, each working

ATQ, Let the required time be d days. So, 21 6 15 18 d 5 Or, 1,890 90 d Or, d 21

6 hours a day, complete a school project in 15 days. How many days will it take for 18 boys, working 5 hours daily, to finish the same project?

A 21

B 11

C 19

D 32

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