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C
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Difficulty:
35%
(medium)
Question Stats:
72% (02:19) correct
28%
(02:17)
wrong
based on 75
sessions
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In the figure, ABCD is a rectangle. The area of quadrilateral EBFD is one-half the area of the rectangle ABCD. Which one of the following is the value of AD ?
(A) 5
(B) 6
(C) 7
(D) 12
(E) 15
Attachment:
#GREpracticequestion In the figure, ABCD is a rectangle..jpg [ 22.21 KiB | Viewed 7538 times ]
18 Mar 2019, 06:34
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Bunuel
APPROACH #1:
IMPORTANT: the diagrams in GMAT problem solving questions are DRAWN TO SCALE unless stated otherwise.
So, we can use this fact to solve the question by simply "eyeballing" the diagram.
Since ED = 3, we know that AE is a little by longer than 3
I'd say that AE has length 4 or 5
So, AD has a total length of 7 or 8
Only answer choice C is close to our estimate.
Answer: C
Cheers,
Brent
18 Mar 2019, 06:43
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Bunuel
APPROACH #2:
Let AD have length x
Let AB have length y
Area of rectangle ABCD = (base)(height) = xy
Since ABCD is a rectangle, we know that sides ED and BF are parallel
This means quadrilateral EBFD is a TRAPEZOID
Let y be the height of the trapezoid
This means ED and BF are the two bases of the trapezoid
Area of trapezoid = (base1 + base2)(height)/2
= (3 + 4)(y)/2
= 3.5y
The area of quadrilateral EBFD is one-half the area of the rectangle ABCD.
We can write: 3.5y = (1/2)xy
Multiply both sides by 2 to get: 7y = xy
Divide both sides by y to get: 7 = x
Which one of the following is the value of AD ?
Since AD has length x, we know that AD = 7
Answer: C
Cheers,
Brent
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