Question 1198765
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A flower garden is shaped like a circle. Its diameter is 38yd. 
A ring-shaped path goes around the garden. The width of the path is 5yd.
The gardener is going to cover the path with sand. 
If one bag of sand can cover 7yd2, how many bags does the gardener need?
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<pre>
The area of the ring-shaped path is the difference of the areas
of the larger and smaller circles. So we write


    the area of the ring-shaped path = {{{pi*(19+5)^2}}} - {{{pi*19^2}}} = {{{3.14*(24^2-19^2)}}} = 675.1 yd^2.


To determine the number of bags, we divide it by 7 yd^2

    {{{675.1/7}}} = 96.44


and round it to the closest greater integer, which is 97.


<U>ANSWER</U>.  The gardener needs 97 bags of sand.
</pre>

Solved.