SOLUTION: The gasoline gauge on a van initially read 1/8 full. When 15 gallons were added to the tank, the gauge read 3/4 full. How many more gallons are needed to fill the tank. Please show

Question 262824: The gasoline gauge on a van initially read 1/8 full. When 15 gallons were added to the tank, the gauge read 3/4 full. How many more gallons are needed to fill the tank. Please show how to set up this problem (along with the answer). thank you.
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
right now we are at 1/8 full
15 gallons got us up to 3/4 = 6/8.
This means 15 gallons is the same as 5/8 tank.
We can create a proportion to get our answer as

step 1 - cross multiply to get

step 2 - multiply 15 by (8/5) to get

So, 24 - 15 = 9 gallons to fill the tank.
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