Question

Paul​'s car holds at most 20 gallons of gas. Now it has 9 gallons. Use pencil and paper. Explain how to find the amount of gas he ​needs, in​ liters, to fill the gas tank.

Answer 1

11 gallons

Explanation:

first, you make the equation:

9+x=20

Then you rearrange the terms

Then you calculate:

x=20-9

20-9=11

So, x=11

Hope this helps :)