15 men can complete a work in 12 days. After working for 6 days, 5 more men join them. In how many days will the remaining work be completed?
Show answer & explanation
Correct answer: C
Explanation
Total work = 15 × 12 = 180 man-days
Work done in 6 days = 15 × 6 = 90 man-days
Remaining work = 180 - 90 = 90 man-days
Now, total men = 15 + 5 = 20
Time to complete the remaining work = 90 ÷ 20 = 4.5 days