MATH

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7/10 of Delia's money is equal to 1/5 of
Sarah's money. They have $225 altogether
How much does Delia have?

  • MATH -

    Delia's money --- d
    Sarah's money --- s

    d+s = 225

    (7/10)d = (1/5)s
    7d/10 = s/5
    35d = 10s
    d = 10s/35

    sub into d+s = 225
    10s/35 + s = 225
    times 35
    10s + 35s = 7875
    s = 175
    then d = 225-175 = 50

    Deliah has $50 and Sarah has $175

    check: (7/1)(50) = 35
    (1/5) of 175 = 35
    yeahhh!

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