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Colin is working to earn some money for a CD player.On Saturday he earned half as much as he did on Sunday,but twice as much as he did on Friday.During those three days he earned $70.How much did he earn each day?

  • math -

    let Sat's earnings be x
    Sunday = 2x
    Friday = x/2

    x + 2x + x/2 = 70
    7x/2 = 70
    x = 20

    Friday: 10
    Saturday: 20
    Sunday: 40

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