Time and Work - Arithmetic Aptitude Questions and Answers

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5 men and 12 boys finish a piece of work in 4 days, 7 men and 6 boys do it in 5 days. The ratio between the efficiencies of a man and boy is?

1:2

2:1

2:3

6:5

Answer : Option D

Explanation :

5M + 12B ----- 4 days

7M + 6B ------- 5 days

20M + 48B = 35M + 30B

18B = 15M => 5M = 6B

M: B = 6:5

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