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GMAT Diagnostic Test Question 2

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Manager
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Status: MBA Aspirant
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WE: Information Technology (Investment Banking)
Re: GMAT Diagnostic Test Question 2 [#permalink]

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New post 28 Oct 2011, 22:35
Eash question. Not a 700 level one.
Ans is E

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Re: GMAT Diagnostic Test Question 2 [#permalink]

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New post 30 Oct 2011, 03:47
OMG - i chose A, i know this and i did a mistake

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Re: GMAT Diagnostic Test Question 2 [#permalink]

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New post 16 Apr 2012, 23:53
Hi,

I think this question is way too easy to be classified as a 700-level question. :o

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Re: GMAT Diagnostic Test Question 2 [#permalink]

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New post 17 Apr 2012, 01:14
u can solve these kind of questions always by making factors...

the first part sum up to 125.
now u can write 125 as 5 X 5 X 5 .. this will give you 5 X sqrt(5)

similarly 20 can be factored into 2 X 2 X 5.. this will give you 2 X sqrt(5)

adding both gives you the answer 7 X sqrt(5)
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Re: GMAT Diagnostic Test Question 2 [#permalink]

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New post 17 Apr 2012, 02:38
straight 7\sqrt{5}...........!!!
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Re: GMAT Diagnostic Test Question 2 [#permalink]

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New post 19 Sep 2012, 22:01
\sqrt{125}=\sqrt{36+64+25=[square_root]125}[/square_root]
=5\sqrt{5}+\sqrt{4*5}=5+2\sqrt{5}
=7\sqrt{5}
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Rajeev Nambyar
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Re: GMAT Diagnostic Test Question 2 [#permalink]

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New post 04 Oct 2013, 03:27
\(\sqrt{36+64+5^2} + \sqrt{20} = ?\)

A. \(19 + \sqrt{20}\)
B. \(19\sqrt{20}\)
C. \(\sqrt{145}\)
D. \(5\sqrt{100}+\sqrt{20}\)
E. \(7\sqrt{5}\)[/quote]


36 + 64 + 25 = 125

square root(125) + square root(20).
125 = 5 * 25 ie 5 square root(5).

20 = 2 square root(5)

ie 5 square root(5) + 2 square root(5) = 7 square root(5).

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Re: GMAT Diagnostic Test Question 2   [#permalink] 04 Oct 2013, 03:27

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