4 men and 5 women can complete a work in 15 days, where as 9 men and 6 women can do it in 10 days. So in order to complete the same work in 7 days how many women should assist 8 men?
(a) 14
(b) 12
(c) 11
(d) 13
Sol:
Total work = (4M + 5W) × 15 = (9M + 6W) × 10
⇒ 6M = 3W
