Math

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Mira has 20 gallons of water. She used 8 1/2 gallon to water the roses and 7 1/2 gallons to water lilies. How much water does she use have left?

  • Math -

    20 - (8 1/2 + 7 1/2) = _________ gallons

  • Math -

    how many half gallons?
    started with 40 which is 2*20
    first used 17 which is 2*8 +1
    then used 15 which is 2*7 +1
    so
    40 - 17 - 15 = 8 half gallons
    which is 4 whole gallons.

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