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A square flower bed is 10 feet long on a side. How many plants are needed if they are spaced 6 inches apart around the outside of the bed?
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asked by ann
  1. Outer perimeter: 4s=4*10'=40'
    Spacing = 6" = 0.5'/plant
    Number required
    = 40'/0.5'/plant
    = 80 plants

    Since the perimeter is a closed figure, there is no need to add one "at the end" as in the case of a linear row with two ends.

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    posted by MathMate

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