If your car gets 30 miles per gallon, how much does it cost to drive 400 miles when gasoline costs $2.50 per gallon?

Question

If your car gets 30 miles per gallon, how much does it cost to drive 400 miles when gasoline costs $2.50 per gallon?

Answer 1

at 30 mpg, going 400 miles requires 400/30 gallons - 40/3 = 13 1/3 gallons

at $2.50 per gallon, it costs 5/2 x 40/3 = 100/3 = $33.33 to go 400 miles, rounded off to nearest penny