Alternate Solution:
Let a man do ‘m’ work in a day and a boy do ‘b’ work in a day. Let the total work be ‘W’.
W = 5 (12m + 16b) -> Equation (1)
Also, W = 4 (13m + 24b) -> Equation (2)
Combining equations (1) and (2)
⇒ 60m + 80b = 52m + 96b
⇒ 8m = 16b
⇒ m/b = 2/1
Therefore, the ratio m:b = 2:1
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