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7 October, 13:09

During one month, Jack, Bob, and Jerry earned a total of $115. If Bob earned twice as much as Jack, and Jerry earned $15 more than Jack, how much did each earn?

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  1. 7 October, 13:29
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    Jack - $ x

    Bob - $ y

    Jerry - $ z

    x+y+z=115 (1)

    y=2x (2)

    z=x+15 (3)

    We can substitute (2) and (3) into (1).

    x+2x+x+15=115

    4x=115-15

    4x=100

    x=$25 (Jack)

    y=2x=2*25=50

    y=$50 (Bob)

    z=x+15=25+15=40

    z=$40 (Jerry)
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