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GRE Math Challenge#100-A rectangular solid has a square base
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09 May 2015, 12:04
09 May 2015, 12:04
Expert Reply
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Question Stats:
66% (00:43) correct
33% (00:00) wrong based on 3 sessions
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A rectangular solid has a square base and altitude of 7. If the volume of the solid is 252, then the perimeter of the square base is
(A) 9
(B) 24
(C) 28
(D) 36
(E) 49
(A) 9
(B) 24
(C) 28
(D) 36
(E) 49
Re: GRE Math Challenge#100-A rectangular solid has a square base
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18 Dec 2017, 21:55
18 Dec 2017, 21:55
sandy wrote:
A rectangular solid has a square base and altitude of 7. If the volume of the solid is 252, then the perimeter of the square base is
(A) 9
(B) 24
(C) 28
(D) 36
(E) 49
(A) 9
(B) 24
(C) 28
(D) 36
(E) 49
Here given
Altitude = 7
and square base i.e Length = width = x
We know the volume of rectangular solid = Length * width * height
therefore 252 = x * x * 7
or x^2 = 36
or x =6 (neglect the negative value)
Now perimeter of square base = 4 * x = 4 * 6 =24
gmatclubot
Re: GRE Math Challenge#100-A rectangular solid has a square base [#permalink]
18 Dec 2017, 21:55
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