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Maggie, hoping for a safe trip, offers you this tip: the tank holds up to 50 gallons. If you divide the tank into 10 parts -- just like the gauge -- that's 5 gallons per part.

50 gallons divided by 10 parts equals 5 gallons per part

3/10 a tank means only three of those five-gallon parts are full, so how many gallons are in the tank?

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