Posted by Anonymous on Tuesday, November 25, 2008 at 1:08pm.
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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