Question

It takes for three gardeners 90 minutes to weed a garden. If the job is to be done in only 15 minutes, how many more gardeners need to be put on the jobs?

Answer 1

3 gardeners :90 minutes
? Gardeners : 15 minutes
1 gardener : 270 minutes
? Gardeners : 270/15
18 gardeners

Answer 2

The answer is 15 gardeners.
Thus, 15 gardeners would be needed if the job is to be done in only 15 minutes.