Correct Answer: Option A
Let 1 man's 1 day's work = x and 1 boy's 1 day's work = y.
Then, 6x + 8y = 1/10 and 26x + 48y = 1/2
Solving these two equations, we get : x = 1/100 and y = 1/200
(15 men + 20 boy)'s 1 day's work = (15/100) + (20/200) = 1/4
So, 15 men and 20 boys can do the work in 4 days.
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