Lea's car travels an average of 30 miles per gallon of gas. If she spent $20.70 on gas for a 172.5 mike trip, what was the approximate cost of gas in dollars per gallon?

The correct answer is 3 dollars and 60 cents

$3.60

First we need to find the number of gallon she took in the trip

the number of gallons = 172.5/30

the number of gallons = 5.75

She took 5.75 gallon of gas

Second, find the cost per gallon

the cost = gallons cost/the number of gallons

the cost = 20.70/5.75

the cost = 3.6

The approximate cost of gas per gallon is $3.60