Question

A teacher must grade 32 reports. She can grade 4 reports in 90 minutes. How many hours will it take to grade 32 reports?

Answer 1

12 hours or 720 minutes

Explanation:

If 4 reports are graded in 90 minutes, and that there are 60 minutes in an hour. Assuming this is a constant rate, the time taken to grade 32 reports would be:

4 reports / 90 minutes × 60 minutes / hour = 32 reports / x hours.

Where x is the amount of hours taken to grade 32 reports.

→

4 reports × 1 hour /

Answer 2

The teacher will take 720 minutes or 12 hours to grade 32 reports.

Explanation:

32 reports= x

4 reports= 90 minutes

Cross multiply method

90*32= 4x

2880= 4x

x= 720

The teacher will take 720 minutes or 12 hours to grade 32 reports.

Hope this helps!