A coffee grinder can grind 3⁠ 1/2 pounds of coffee beans in 5 minutes. Find the unit rate per minute.

Answer 1

To determine the unit rate (or the number of pounds ground in a minute), divide 3 1/2 by 5.

Note: 3 1/2 = 7/2

Then 7/2 divided by 5 is equivalent to multiplying 7/2 by the reciprocal of 5 , which is 1/5:

7/2 * 1/5 = 7/10 pound per minute

The unit rate is 7/10 pound per minute of 0.7 pound per 1 minute