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20 November, 14:13

Anna is preparing the soil in her garden for planting tomatoes. The directions say to use 4 pounds of fertilizer for 120msquare feet of soil. How much fertilizer is needed for a 180 square-foot garden

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  1. 20 November, 14:37
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    6 pounds of fertilizer.

    Step-by-step explanation:

    We can solve this problem using rule of three:

    Anna needs to use 4 pounds of fertilizer for each 120 square feet of soil. With that values, we make the first fraction: 4/120

    Now, she needs X pounds of fertilizer for 180 square feet of soil. The fraction now is X/180

    Then, we need to make the first fraction equal to the second, and then find the value of X:

    4/120 = X/180

    X = 4*180/120 = 6

    So Anna will need 6 pounds of fertilizer.

    Another way to solve this problem is calculating the amount of soil for one pound of fertilizer:

    If 4 pounds of fertilizer is necessary for 120 square feet of soil, 1 pound is necessary for 120/4 = 30 square feet of soil.

    If we have 180 square feet of soil, we divide 180 by 30 to find the amount of fertilizer necessary:

    180/30 = 6 pounds of fertilizer.
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