Question

mrs. diaz graded 24 tests in 0.5 hours. how many tests per hour did she grade? a 48 b 12 c 10 d 8

Explanation:

Step1: Identify the rate formula

To find the number of tests per hour, we use the formula for rate: \( \text{Rate} = \frac{\text{Number of tests}}{\text{Time in hours}} \). But since we want tests per hour, and we know the time is 0.5 hours, we can also think of it as how many tests she would grade in 1 hour. If she grades 24 tests in 0.5 hours, then in 1 hour (which is twice 0.5 hours), she would grade twice as many tests.

Step2: Calculate the number of tests per hour

We can calculate this by dividing the number of tests by the time in hours: \( \text{Tests per hour} = \frac{24}{0.5} \). Dividing by 0.5 is the same as multiplying by 2, so \( 24 \times 2 = 48 \).

Answer:

A. 48