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Maths P5

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Daniel, Susan and Rick bought some cookies to sell. The cookies were sold at 6 for $2. Daniel sold 1/4 of the cookies. Susan sold 2/7 as many cookies as Rick. Daniel and Susan sold a total of 120 cookies.
a)How many cookies did they sell altogether?
b)How much did they collect from the cookies sold?
c)If the cookies costs $0.20 each, how much profit did they make from the sale?

  • Maths P5 -

    X = total # of cookies bought.

    X/4 = The # of cookies sold by Daniel.

    Y = The # of cookies sold by Rick.

    2Y/7 = The # of cookies sold by Susan.

    X/4 + 2Y/7 = 120 = The # of cookies sold by Daniel and Susan.
    Multiply both sides by 28:

    Eq1: 7x + 8y = 3360.

    y = x - 120,
    Eq2: x - y = 120.

    Multiply Eq2 by 8 and add to Eq1:
    7x + 8y = 3360
    8x - 8y = 960
    Sum: 15x = 4320,
    X = 288 = The # of cookies sold.

  • Maths P5 -

    b. Amt = $2/6 * 288 = $96.

    c. Cost = $.20 * 288 = $57.60.

    Profit = $96 - $57.60 = $38.40.

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