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02 May 2016, 23:00
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E
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Difficulty:
25%
(medium)
Question Stats:
82% (02:37) correct
18%
(02:50)
wrong
based on 112
sessions
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A rectangular room has the rectangular shaped rug shown as above figure such that the rug’s area is 120 square feet and its length is 2 feet longer than its width. If the uniform width between the rug and room is 2 feet, what is the area of the region uncovered by the rug (shaded region), in square feet?
A. 32
B. 36
C. 40
D. 46
E. 104
* A solution will be posted in two days.
A. 32
B. 36
C. 40
D. 46
E. 104
* A solution will be posted in two days.
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없음.png [ 6.08 KiB | Viewed 3080 times ]
02 May 2016, 23:47
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Rug's area = 120
which is (x) x (2+x) = 120
so x= 10
rug maintains a uniform distance of 2 feet
so room has dimension 10+4 and 12+4 i.e. 14 and 16
area of room 14x16 = 224
area covered is 120
so uncovered area is 224-120=104
which is (x) x (2+x) = 120
so x= 10
rug maintains a uniform distance of 2 feet
so room has dimension 10+4 and 12+4 i.e. 14 and 16
area of room 14x16 = 224
area covered is 120
so uncovered area is 224-120=104
04 May 2016, 21:49
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As you can see from the question, rug’s area is 120 and the length is 2 feet longer than the width.
Hence, we can obtain a figure like the one below. So, if we calculate, we get (12+4)(10+4)-12*10=104. The correct answer, thus, is E.
Hence, we can obtain a figure like the one below. So, if we calculate, we get (12+4)(10+4)-12*10=104. The correct answer, thus, is E.
Attachments
.png [ 7.73 KiB | Viewed 2968 times ]
