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When 6 gallons of gasoline are put into a car's tank the indicator goes from 1/4 of a tank to 5/8. What is the total capacity of the gas tank?

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  1. let the number of gallons in the tank be x

    (5/8)x - (1/4)x = 6
    (3/8)x=6
    x = 16

    check:
    1/4 full would be 4 gall
    5/8 full would be 10 gallons
    must have put in 6 gallons, all is good!

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