Question

Mr S has graded 30 tests already, and can grade 10 tests per hour. Ms J, on the other hand, has graded 10 tests and can grade 8 per hour. After how many hours of grading will Mr S and Ms J have graded the same amount of tests?

Answer 1

Ms. J has graded 10 tests already and can grade 8 tests per hour. After h hours, she will have graded an additional 8h tests.

Now, we can set up an equation to find when they have graded the same number of tests:

30 + 10h = 10 + 8h

Now, let's solve for h:

2h = 30 - 10
2h = 20

Divide both sides by 2:

h = 20 / 2
h = 10

So, it will take 10 hours of grading for Mr. S and Ms. J to have graded the same number of tests.