4 men and 6 women finish a job in 8 days, while 3 men and 7 women finish it in 10 days. In how
many days will 10 women working together finish it ?
Choose the correct choice from the following options
A) 30 days B) 40 days C) 50 days D) 60 days E) None of these
Explanation:   Let 1 man's 1 day work = x   and 1 woman's 1 days work = y.   Then, 4x + 6y = 1/8   and 3x+7y = 1/10   solving, we get y = 1/400 [means work done by a woman in 1 day]   10 women 1 day work = 10/400 = 1/40   10 women will finish the work in 40 days   Answer: 40 days
<result>B</result>
4 men and 6 women finish a job in 8 days, while 3 men and 7 women finish it in 10 days. In how
many days will 10 women working together finish it ?