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math

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jake spent 3/8 of his money on a book and 1/2 of what was left on a magazine.he now has $6.25. how much money did he start with?

please help me i am confused...
thank you :)

  • math -

    after spending 3/8 of $x he has 5x/8 left
    then he spends 1/2 of that, leaving
    5x/16

    5x/16 = 6.25
    5x = 100
    x = 20

    check: 3/8 of 20 = 7.5
    leaving him with 20-7.5 = 12.50
    1/2 of that is 6.25, leaving him with 6.25, Check!

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