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GRE Math Challenge#100-A rectangular solid has a square base

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GRE Math Challenge#100-A rectangular solid has a square base [#permalink] New post 09 May 2015, 12:04
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Question Stats:

50% (00:50) correct 50% (00:00) wrong based on 2 sessions
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
[Reveal] Spoiler: OA

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Re: GRE Math Challenge#100-A rectangular solid has a square base [#permalink] New post 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



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
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Re: GRE Math Challenge#100-A rectangular solid has a square base   [#permalink] 18 Dec 2017, 21:55
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GRE Math Challenge#100-A rectangular solid has a square base

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