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05 Feb 2012, 15:55
Kudos
Bookmarks
D
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Difficulty:
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Question Stats:
92% (01:01) correct
8%
(01:28)
wrong
based on 974
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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
A) 34
B) 40
C) 68
D) 88
E) 102
05 Feb 2012, 16:01
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fiendex
As the one side of her rectangular yard is 20 feet and the area is 680 square feet, then x*20=680 (where x is the other side of a rectangular yard) --> x=34 feet;
She wants to put up fencing around three sides, but one with 20 feet, hence she'll need 2*34+20=88 feet of fencing.
Answer: D.
Hope it's clear.
08 Oct 2019, 09:09
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fiendex
Here's a sketch of what we're dealing with:
Given: area of the rectangle = 680
Area = (base)(height) = (x)(20) = 20x
So: 20x = 680
Solve: x = 680/20 = 34
We now have:
Perimeter = 34 + 34 + 20 = 88
Answer: D
Cheers,
Brent
