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March 28, 2017

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Jim paid $3.99 for a 14-ounce bag of cookies. What was the
unit cost per pound?

  • mathematics - ,

    $3.99 / (14/16 lb) = (8/7)*($3.99) = $4.56/lb

  • mathematics - ,

    More than one way to skin a cat. Proportions come up a lot and this can be solved as one.

    State the relationship you need verbally.

    "3.99 is to 14, as x is to 16"

    Then set up a proportion.

    3.99 x
    ---- = ----
    14 16

    Cross-multiply, giving:

    14x = 16(3.99)

    Divide both sides by 14, giving:

    x = (16/14)3.99

    Reduce:

    x = (8/7)3.99

    Finally, you need to pull out your calculator.

    x = 31.92/7
    x = 4.56


    That is the cost per 16 ounces: that is, per pound.

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