A can complete a work in 31 days and B in 24 days. If both work together, in how many days will the work be completed? MCQ with Answer and Explanation

Explanation:
3 Men = 5 Women => 6 Men = 10 Women. 6 men + 5 women = 10 women + 5 women = 15 women. Since 5 women take 12 days, 15 women will take (5 * 12) / 15 = 60 / 15 = 4 days.

Explanation:
Combined time for full work multiplied by 0.75 = 7.8 days.

Explanation:
Ratio of efficiency of A to B = 2 : 1. Ratio of time taken by A to B = 1 : 2. Difference in time = 2 - 1 = 1 part, which corresponds to 15 days. Therefore, time taken by B = 2 * 15 = 30 days.