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Question

You buy 8 gallons of gasoline at $p$p​  dollars per gallon and pay $23.20. Write an equation to find the price of one gallon of gasoline. Then fine the price of one gallon of gasoline.

Answer 1

As a good rule of thumb if you are having trouble its good to make sure you understand what the variables would mean:

d is price of gas per gallon

p is the total amount of money you spend

Given that you bought 8 Gallons of gas and payed a total of $23.20 your equation would look like this:

8d = 23.20

You then divide 23.20 (Total Price) by 8 (Gallons of Gas you bought) to get the price you paid for each gallon.

d = 23.20 / 8

The answer comes out to be d = 2.9

Remember that d is the cost of gas per gallon so the correct way to write the answer would be $2.90

Answer 2

Dollars is your unknown; therefore, we will refer to dollars as d.

Equation:

8d = $23.20

Solve the equation by dividing both sides by 8.

8d/8 = 23.20/8

d = $2.90

Make sure your final answer is written as money.

You spend $2.90 per gallon.