the gasoline gauge on a van initially read 3/8 full. when 12 gallons were added to the tank, the gauge read 5/8 full. how many more gallons are needed to fill the tank?

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Let \(x\) be the size of the tank. Can you create an equation based on the information given?

We could write 3/8 of tank as \(\frac 3 8 x\) and 5/8 of tank as \(\frac 5 8 x\)

"3/8 full. when 12 gallons were added" becomes \(\frac 3 8 x + 12\)

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