Question

Leah solved 40 arithmetic problems in 2 1/2 minutes. Which of the following best represents her unit rate?

A. 2 1/2 problems per minute

B. 8 problems per minute

C. 16 problems per minute

D. 40 problems per minute

Answer 1

Leah's unit rate is 16 problems per minute.

Explanation:

To find her unit rate, we need to find how many problems she can do in 1 minute. Our current fraction is
`(40)/(2.5)`. We need to divide the top and bottom by 2.5 to get the rate per minute

`(40)/(2.5)` =
`(16)/(1)`

Leah's unit rate is 16 problems per minute.