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John wants to put a circular garden in his back yard. The garden has a diameter of 16 feet. He needs to cover the garden with peat moss. Each bag of peat moss can cover 90 square feet. How many bags does he need?

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    The area of John's back yard garden will be A = pi*r^2 where r = radius = 1/2 the diameter.
    Then set up a proportion as follows:
    (1 bag/90 ft^2)=(x bags/area garden)
    solve for x bags. The answer I obtained is 2.23 bags; therefore, John must buy 3 bags.

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