If a gas tank currently contains 15 liters of gas and is 3/8 full, how many additional liters of gas are needed to fill up the tank

Answer 1

Let "x" be the amount of gas in a full tank. That means x times 3/8 will equal 15

3/8x = 15 [multiply both sides of the equation by 8/3 to get:

x = 15(8/3) = 40 liters

Check this by multiplying 40 by 3/8 to see if you get 15

That means the amount of additional liters required to fill the tank is 40 - 15 which is 25 liters.