Question

A person's car uses 4 gal of gasoline to travel 156mi. He has 3 gal of gasoline in the car, and he wants to know how much more gasoline he will need to drive 300mi. If we assume that the car continues to use gasoline at the same rate, how many more gallons will he need? He will need about more gallons of gas. (Type an integer or decimal rounded to one decimal place as needed.)

Answer 1

He needs an extra 4.69 gal.

Explanation:

156 mi uses 4 gal.

156/4 = 39 miles per gallon

To go 300 miles he needs:

300/39 = 7.69 gal

He has 3 gal.

7.69 gal - 3 gal = 4.69 gal

He needs an extra 4.69 gal.