Question

A farmer needs to plant 180 tomato plants. He can plant 9 plants every 15 minutes.

a) What percentage of the planting will be complete after 75 minutes?

It will be
% complete.



b) How many minutes will it take to finish 90% of the planting?

It will take ____ minutes.

Answer 1

52.94%

270 minutes

Explanation:

1. 9 plants - 15 minutes

x plants - 75 minutes

Cross multiply

15x = 75 x 9

15x = 675

Divide both sides by 15

x = 675/15

x = 45 plants

45/85 x 100

= 52.94%

2. 90% of 180

= 90/100 x 180

= 162 plants

9 plants - 15 minutes

162 plants - x minutes

Cross multiply

9x = 162 x 15

9x = 2430

Divide both sides by 9

x = 2430/9

x = 270 minutes or 4 hours 30 minutes.