Mr. Sonny's science class is calculating the average number of blinks per minute. Jan blinks 140 times in 7 minutes. What is her blinking rate, in blinks per minute?

Question

A.
33 blinks per minute
B.
10 blinks per minute
C.
20 blinks per minute
D.
21 blinks per minute

Answer 1

To find Jan's blinking rate in blinks per minute, we need to divide the total number of blinks by the total number of minutes.

Jan blinks 140 times in 7 minutes.

We can calculate her blinking rate as follows:

\[ \text{Blinking Rate} = \frac{\text{Total Blinks}}{\text{Total Minutes}} = \frac{140 \text{ blinks}}{7 \text{ minutes}} = 20 \text{ blinks per minute} \]

Thus, Jan's blinking rate is 20 blinks per minute.

The correct answer is C. 20 blinks per minute.