Two sisters drove 144 miles on a camping trip. they averaged at least 32 miles per gallon on the trip. describe the number of gallons of gas they used.

For this case, the first thing we must do is define variables.

We have then:

n: number of gallons

d: distance traveled

r: distance rate per gallons

The equation that relates the variables is given by:

Substituting values we have:

The number of gallons of gas they used is:

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