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

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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) About Me  (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
15%2F%285%2F8%29+=+G%2F1
step 1 - cross multiply to get
15+=+%285%2F8%29G
step 2 - multiply 15 by (8/5) to get
24+=+G
So, 24 - 15 = 9 gallons to fill the tank.