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15 August, 11:24

A bag of concrate can be used to make a 5ft by 7ft porch. if you want to make a 20ft by 28ft, porch. how many bags of concreate do you need? the answer is not 4

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  1. 15 August, 11:29
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    area of 5 x 7 porch = 5*7 = 35 sq. ft.

    area of 20 x 28 porch = 20 * 28 = 560 sq. ft.

    560 / 35 = 16

    so 16 bags are needed
  2. 15 August, 11:42
    0
    Calculate the area of each rectangular:

    5x7 = 35sqft

    20x28 = 560sqft

    If 1 bag makes 35sqft, 560sqft is how many bags;

    This is how I write the equation;

    1x bag 35sqft

    X 560sqft

    Solution: (560x1) : 35 = 16bags

    I solved this based on my way of logic. I'd appreciate if you let me know if the answer is correct.
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