SOLUTION: Sal added3 gallons of gas to a tank,which made the tank half full. A full tank containef f gallons. How many gallons were in the tank originally

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Question 965084: Sal added3 gallons of gas to a tank,which made the tank half full. A full tank containef f gallons. How many gallons were in the tank originally
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Half full is f/2.

Let u be the unknown number of gallons in tank at the beginning.
u%2B3=f%2F2

Solve for u.
highlight%28u=f%2F2-3%29