25 men with 10 boys can do in 6 days as much work as 21 men with 30 boys can do

Question

25 men with 10 boys can do in 6 days as much work as 21 men with 30 boys can do in days. How many boys must help 40 men to do the same work in 4 days ?

Options:

A . 5

B . 10

C . 20

D . 40

Answer: Option B

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