A can complete a work in 10 days and B in 20 days. After working together for 5 days, what percentage of work remains? MCQ with Answer and Explanation

Explanation:
Total work = 9 × 19 = 171 man-days. Required days = 171/13 = 13.15 days.

Explanation:
Remaining work = (1 - 5*(1/16+1/26)) ×100 = 49.52%.

Explanation:
Total work = 12M * 4 = 48 man-days = 15W * 4 = 60 woman-days. So, 48M = 60W => 4M = 5W => 1M = 1.25W. Work done by 6 men in 2 days = 12 man-days. Remaining work = 48 - 12 = 36 man-days. Converting to woman-days: 36 * 1.25 = 45 woman-days. To complete 45 woman-days in 3 days, number of women required = 45 / 3 = 15 women.