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20 February, 17:09

Marissa earned $560 in the summer. she earned $40 each week for part of the summer and $60 each week for the rest. If she earned $40 each week twice as often as she earned $60, how many weeks did she earn $40?

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Answers (2)
  1. 20 February, 18:27
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    80x+60x=560

    140x=560

    X=4

    4*2=8 so Marissa earned $40 a week for 8 weeks
  2. 20 February, 19:59
    0
    She earned $40 each week twice as often as she earned $60.

    Let us say she earned $60 for x weeks.

    Therefore $40 was for 2x weeks.

    Her total = $560.

    40 (2x) + 60 (x) = 560

    80x + 60x = 560

    140x = 560

    x = 560 / 140 = 4

    x = 4 weeks.

    But $40 was for 2x weeks.

    = 2 * (4) = 8.

    $40 was for 8 weeks.
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