4 men and 5 women can complete a work in 15 days, whereas 9 men and 6 women can do it in 10 days. To complete the same work in 7 days, how many women should assist 4 men ?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 ie 13.
(4m + 5w) × 15 = (9m + 6w) × 10
2m = w
m : w
1 : 2
(4 + 2x) × 7 = 14 × 15
2x = (210 / 7) - 4
2x = 30 - 4
2x = 26
x = 13