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

each gardener takes 3*90 = 270 minutes to do the job alone.

So, since 15 = 270/18

It will take a total of 18 gardeners.

Answer 2

Good ....

Answer 3

Good

Answer 4

Good ...felling better by observing this answer