20 men can complete the work in 10 days. Five days after they started working, 5 more men joined them. In how many days will the total work be completed?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 9.
Total work = 20 × 10 = 200 units
Work in first 5 days = 20 × 5 = 100 units
Remaining work = 200 − 100 = 100 units
Now, number of men = 20 + 5 = 25
Remaining days = = 4
Total time = 5 + 4 = 9 days