SOLUTION: A garden path around a circular garden is 5 feet wide all they way around and the distance around the outside of the garden path is 80 feet. If a bag of gravel will cover an area

Question 858989: A garden path around a circular garden is 5 feet wide all they way around and the distance around the outside of the garden path is 80 feet. If a bag of gravel will cover an area of 10 square feet, how many bags of gravel will the gardener need to cover the path? Explain
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Diameter including walkway = 80 feet
so radius = 40 feet
the width is 5 feet
so the garden radius = 35 feet
Area of walkway = total area - garden area
Total area = pi*r^2
=pi*40^2
garden area = pi*35^2
Difference = pi*40^2-pi^35^2
=pi(40^2-30^2)
= 121 sq.ft

10 sq.ft ----------------1 bag
121 sq.ft ---------------?
121/10
=12.1 bags
= 13 bags of gravel

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