This problem is a checkpoint for unit rates and proportions. It will be referred to as Checkpoint .

In parts (a) and (b), compute the unit rate. In parts (c) and (d), solve the proportion.  

1. Tina drove $108$ miles and used $4.5$ gallons of gasoline. Compute the miles per gallon.

2. If $17$ oranges cost $\$3.23$, compute the cost per orange.

Check your answers by referring to the Checkpoint materials materials located at the back of your book.

Ideally, at this point you are comfortable working with these types of problems and can solve them correctly. If you feel that you need more confidence when solving these types of problems, then review the Checkpoint materials and try the practice problems provided. From this point on, you will be expected to do problems like these correctly and with confidence.