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16 March, 20:46

2. Solve the following proportion. r/5=9/21 A. r=9 B. r=2.14 C. r=11.66 D. r=37.8

3. A recipe calls for 4 cups of sugar to make 4 dozen cookies. Use the proportion to calculate how much sugar is needed to make 8 dozen cookies.

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  1. 16 March, 20:57
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    2. r/5=9/21

    r x 21 = 9 x 5

    r = 45/21

    r = 2.14 (the answer is B)

    3. 4 cups-> 4 dozen

    x cups-> 8 dozen

    4/x = 4/8

    X x 4 = 4 x 8

    x = 32/4

    x = 8 cups
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