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GMAT Diagnostic Test Question 2

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Status: MBA Aspirant
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Re: GMAT Diagnostic Test Question 2 [#permalink] New post 28 Oct 2011, 21:35
Eash question. Not a 700 level one.
Ans is E
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Re: GMAT Diagnostic Test Question 2 [#permalink] New post 30 Oct 2011, 02:47
OMG - i chose A, i know this and i did a mistake
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Re: GMAT Diagnostic Test Question 2 [#permalink] New post 16 Apr 2012, 22:53
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] New post 17 Apr 2012, 00:14
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] New post 17 Apr 2012, 01:38
straight 7\sqrt{5}...........!!!

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Re: GMAT Diagnostic Test Question 2 [#permalink] New post 19 Sep 2012, 21:01
\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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Re: GMAT Diagnostic Test Question 2 [#permalink] New post 04 Oct 2013, 02:27
\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).
Re: GMAT Diagnostic Test Question 2   [#permalink] 04 Oct 2013, 02:27
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