Question

A teacher can grade 10.5 tests every 30 minutes. How many tests can they grade in two 45 minute prep periods?

Answer 1

31 tests.

Explanation:

The rate for the grading is 10.5 every 30 minutes.

Two 45 minute prep periods are 90 minutes.

90 / 30 = 3.

Since three 30 minute periods fit into 90 minutes, we get

3 x 10.5 = 31.5 tests.

Since a teacher did not finish grading the .5 of the test, we don't count it.

Our answer is 31 tests.