SOLUTION: A builder Needs to lay a concrete path around the outside of an 18m by 15m rectangular area of grass.if the width of the path must be 1m and the concrete must have a depth of 10cm,

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Question 1026970: A builder Needs to lay a concrete path around the outside of an 18m by 15m rectangular area of grass.if the width of the path must be 1m and the concrete must have a depth of 10cm, calculate the amount of the concrete needed by the builder correct to one decimal.
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Except for the adjustment of the solution to a volume afterwards, this instructive video should help you:
rectangular outside border of uniform width

Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
A builder Needs to lay a concrete path around the outside of an 18m by 15m rectangular area of grass.if the width of the path must be 1m and the concrete must have a depth of 10cm, calculate the amount of the concrete needed by the builder correct to one decimal.
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1. The area  S = (18+2)*(15+2) - 18*15 = 70 m%5E2.

2. The volume V = S*d = 70*0.1 = 7 m%5E3.