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If 4 men or 7 boys can do a work in 29 days then 12 men and 8 boys will do the same work in:

A. 29

B. 17

C. 7

D. 21

E. 30

Solution by World Mcqs

Answer: Option C

Explanation:
Solve the question using only boys. The ration 7/29 = x/21+8. The second ration is reverse as the relation between men (or boys) is inverse. If 4 men work equivalent to 7 boys so 12 men are equivalent to 21 boys.

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