A high school math teacher must grade 32 reports on famous mathematicians. She can grade 4 reports in 90 minutes. At this rate how long will it take her to grade all 32 reports?

Question

It has to be in 3 steps

1. identify the unknown
2. identify the formula you need to use
3. solve the equation

Answer 1

4 reports in 90 minutes

32 reports in (32/4)(90) = 8(90) = 720 minutes

32 is 8 times 4, so it takes 8 times as long = 8x90 = 720 minutes

t= (32/4)(90) = 720