Question

Mr. Jones grades 12 exams

in 2 hours. At that rate,
how many hours would it
take to grade 48 exams?

Answer 1

8 hours

Explanation:

To solve this it seems you need to set up a proportion.

12/2=48/x

cross multiply the 2 and 48.

2•48=96.

divide by the remaining number to get x.

96/12=8.

Answer 2

8 hours

Explanation:

12/2= 6
He grades 6 exams per hour
48/6= 8
it would take 8 hours to grade 48 exams

Bonus:
it takes him 10 minutes to grade an exam. That doesnt matter for this question but it's good 2 know