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math

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Sandra spent one-fifth pf her money and loaned one-third of the remainder to her brother Sam. She then had $24. How much money did she have at first?

  • math -

    m - m/5 - (4m/5)/3 = 24
    m - m/5 - 4m/15 = 24
    8m/15 = 24
    m = 24(15/8) = 45

    check:
    started with 45
    spent 9, leaving 36
    lent 12, leaving 24

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