3.89 a gallon of gas. How much will you spend to fill a 20 gallon tank

Question

3.89 a gallon of gas. How much will you spend to fill a 25 gallon tank

Answer 1

For this problem let define our variable and important information needed to set up an equation:

x-represents How much you will spend on gas to fill 20 or 25 gallon tank

$3.89-represents a gallon of gas

20 and 25 gallons-represents total galloons of the tank

The equation would be to multiply the total gallons of the tank by the cost of gas per gallon to find x.

Part 1: 20 gallon tank

20($3.89)=$77.80 Total Cost to fill the 20 gallon tank

Part 2: 25 gallon tank

25($3.89)=$97.25 Total Cost to fill the 25 gallon tank

This problem is related to what I call quantity rate calculation where the quantity is the total gallons of tank multiplied by the rate which is the cost of a gallon of gas.

Any further questions on this problem please let me know.

Answer 2

All you need to do is multiply the price per gallon by the amount of gallons desired:

$3.89 X 20 = $77.80

$3.89 X 25 = $97.25