math

Julian and Stacey needed 10 liters of water to fill a tank. Stacey filled the tank with 3 11/12 liters of water. Julian poured 1 2/5 liters less than Stacey into the tank. How much more water is still needed to fill the tank?

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  1. so, together they used
    3 11/12 + (3 11/12 - 1 2/5) = 6 13/30 liters.
    That left ? to go ...

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  2. 10 -3 11/12 - (3 11/12 - 1 2/5) = 10 - 47/12 - (47/12 - 7/5) =
    10 - 47/12 - 47/12 + 7/5 = 10 -94/12 + 7/5 = 50/5 + 7/5 - 94/12 =
    57/5 - 94/12 = 684/60 - 470/60 = 214/60 = 3 34/60 = 3 17/30 Liters needed.

    Note: The sum of my number and Steve's should be 10.

    Check: 6 13/30 + 3 17/30 = 9 + 30/30 = 10. Yes!!.

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