# What was the average number of miles per gallon?

## Explanation:

**Step by step:**

- Calculate the average number of miles per gallon.
- Jeremy's car traveled 300 miles on 10 gallons of gasoline.
- To find the average number of miles per gallon, divide the total miles by the total gallons used.
- 300 miles per 10 gallons
- Using the formula for average, miles per gallon = total miles / total gallons
- Therefore, miles per gallon = 300 / 10 = 30 mpg

So, the average number of miles per gallon Jeremy's car achieved was 30 mpg.