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What is the ratio of the surface area of a cube to the

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Director
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Joined: 27 Jun 2008
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WE 1: Investment Banking - 6yrs
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What is the ratio of the surface area of a cube to the [#permalink] New post 04 Oct 2008, 06:09
What is the ratio of the surface area of a cube to the surface area of a rectangular solid identical to the cube in all ways except that its length has been doubled?

(1) 1/4
(2) 3/8
(3) 1/2
(4) 3/5
(5) 2
Director
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Re: MGMAT - ratio [#permalink] New post 04 Oct 2008, 06:21
pawan203 wrote:
What is the ratio of the surface area of a cube to the surface area of a rectangular solid identical to the cube in all ways except that its length has been doubled?

(1) 1/4
(2) 3/8
(3) 1/2
(4) 3/5
(5) 2


SA of cube = 6*(x*x) = 6x^2
SA of rectangle = 4*(x*2x) + 2*(x*x) = 8x^2 + 2x^2

Ratio = 6x^2 / 10x^2 = 3/5
Re: MGMAT - ratio   [#permalink] 04 Oct 2008, 06:21
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What is the ratio of the surface area of a cube to the

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