Question 517650: harriet wants to put up fencing around three sides of her rectangular yard and leave a side of 20 feet unfenced. If the yard has an area of 680 square feet, how many feet of fencing does she need ?
a)34
b)40
c)68
d)88
e)102
Note : I Know the Answer but I dont kno How to solve Please help me .
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! harriet wants to put up fencing around three sides of her rectangular yard and leave a side of 20 feet unfenced.
If the yard has an area of 680 square feet, how many feet of fencing does she need ?
:
We're told that one side is 20 ft, by the fact that a 20 ft side is unfenced;
Assume W = 20'
:
Area: L * W = 680
20*L = 680
L = 680/20
L = 34' is the length, (the yard is 34 by 20)
:
Perimeter: P = 2L + 2W, we only have 3 sides to fence, therefore
Fence = 2L + W
Fence = 2(34) + 20 = 88' ft of fence required
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