SOLUTION: how to solve nate and jenny want to order large rocks to use as a border around three rectangular gardens. each garden measures 4 feet by 9 feet, and each rock will measure about 6

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Question 852182: how to solve nate and jenny want to order large rocks to use as a border around three rectangular gardens. each garden measures 4 feet by 9 feet, and each rock will measure about 6 inches across. how many rocks do they need to order?
Answer by josgarithmetic(39799) About Me  (Show Source):
You can put this solution on YOUR website!
We would only assume that the rocks will be used as one length horizontally around each garden. Estimate this area of border this way:
Border+Garden-Garden=Border

%284%2B1%2F2%29%289%2B1%2F2%29-4%2A9=BorderArea
4.5%2A9.5-36=6.75 square feet.

The rocks for border will be most likely in a rectangular arrangement. Treating each rock as if it were a square, it would cover an area %281%2F2%29%281%2F2%29 square foot, or 0.25 square feet.

%286.75%2Aborder%29%2F%280.25%2Arock%29=27
Each rock fits in the border 27 times. The estimate of how many rocks for each garden is 27.