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18 July, 14:19

Lynn put 7/8 gallons of gas in her tank. If there are now 18/6 gallons in the tank, how many gallons did she start with

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  1. 18 July, 15:27
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    17/8 gallons

    Step-by-step explanation:

    18/6 gallons in the tank.

    Before that, she fill 7/8 gallons.

    So,

    18/6 - 7/8

    Subtracting both of these are impossible since the denominators are not equal.

    We can do this by multiplying each other's numerator and denominator by their other denominator.

    6 * 8 = 48

    18 * 8 = 144

    8 * 6 = 48

    7 * 6 = 42

    144 / 48 - 42 / 48

    We can now subtract this. Note: do not subtract the denominator.

    144 - 42 = 102

    102 / 48

    17/8

    So,

    There is 17/8 of gallons in the tank before filling it.
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