Question

Please solve this quick problem?

Answer 1

5 new workers

Explanation:

It takes a total of `15 times 12 = 180` man-days to complete the highway. Until the morning of the 5th day, the crew had devoted `4 times 15 = 60` man-days.

The new workforce completed the rest of the 120 man-days of work in 6 days. Thus there must now have been. `120/6=20` workers - so the number of new workers is `20-15=5`