SOLUTION: A gasoline tank is 7/8 full. After 12 gallons have been used, it is half full. How many gallons does the tank hold when it is full?

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Question 452667: A gasoline tank is 7/8 full. After 12 gallons have been used, it is half full. How many gallons does the tank hold when it is full?



Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = # of gallons of gasoline when tank is full.
==> %287x%29%2F8+-+12+=+x%2F2
==> %287x%29%2F8+-+x%2F2+=+12
==> %283%2F8%29x+=+12
==>+x+=+%288%2A12%29%2F3+=+32 gallons.