4 men and 6 women can complete a work in 8 days, while 3 men and 7 women can complete it in 10 days. In how many days will 10 women complete it?  Choose the correct option:	A) 35	B) 40	C) 45	D) 50	E) 55
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   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.   Answer : 40
<result>B</result>
4 men and 6 women can complete a work in 8 days, while 3 men and 7 women can complete it in 10 days. In how many days will 10 women complete it?