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?

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

The correct answer is 3 dollars and 60 cents

$3.60