Correct Answer: Option B
Let 1 man's 1 day's work = x and 1 woman's 1 day's work = y.
Then, 4x + 6y =1/8 and 3x + 7y =1/10.
Solving the two equations, we get: x =11/400, y=1/400
So, 1 woman's 1 day's work =1/400
=> 10 women's 1 day's work = (1/400 x 10) =1/40.
Hence, 10 women will complete the work in 40 days.
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