Example3. If 5 men and 8 boys can complete a piece of
work in 8 days and 3 men and 12 boys can complete same
work in 10 days then what is respective ratio of the work
efficiency of a man to that of a boy?
(a) 5:24 (b) 5:28
(c) 28:5 (d) 14:5
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Answer:
(c) 28:5
(5M+8B)*8D = (3M+12B)*10D
(5M+8B)*4 = (3M+12B)*5
20M + 32B = 15M + 60B
5M = 28B
M: B = 28: 5
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