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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