A) 35

**B) 40**

C) 45

D) 50

Let 1 man’s 1 day work = x and 1 woman’s 1 day work = y.

Then, 4x + 6y = 1/8 and 3x + 7y = 1/10

Solving these two equations, we get:

x = 11/400 and y = 1/400

10 woman’s 1 day work = (1/400 x 10) = 1/40.

Hence, 10 women will complete the work in 40 days.