12 men and 18 boys, working $$7\frac{1}{2}$$ hours a day, can do a piece of work

Question

12 men and 18 boys, working $$7\frac{1}{2}$$ hours a day, can do a piece of work in 60 days. If a man works equal to 2 boys, then how many boys will be required to help 21 men to do twice the work in 50 days, working 9 hours a day ?

Options:

A . 30

B . 42

C . 48

D . 90

Answer: Option B

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