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# If x > 0 and x^2 = 161, what is the best whole number approximation of

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Retired Moderator
Joined: 22 Jun 2014
Posts: 1093
Location: India
Concentration: General Management, Technology
GMAT 1: 540 Q45 V20
GPA: 2.49
WE: Information Technology (Computer Software)
If x > 0 and x^2 = 161, what is the best whole number approximation of  [#permalink]

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24 Nov 2018, 08:49
00:00

Difficulty:

5% (low)

Question Stats:

93% (00:36) correct 7% (00:44) wrong based on 132 sessions

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If $$x > 0$$ and $$x^2 = 161$$, what is the best whole number approximation of $$x$$?

(A) 13
(B) 18
(C) 41
(D) 80
(E) 2,560

Project PS Butler : Question #38

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Joined: 09 Jun 2018
Posts: 185
Location: United States
GPA: 3.95
WE: Manufacturing and Production (Energy and Utilities)
Re: If x > 0 and x^2 = 161, what is the best whole number approximation of  [#permalink]

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24 Nov 2018, 09:03
x > 0 so, x = + sqrt(161)

We know that 12^2 = 144 and 13^2 = 169, hence, best approximation is 13

Option A
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Re: If x > 0 and x^2 = 161, what is the best whole number approximation of  [#permalink]

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24 Nov 2018, 09:31
HKD1710 wrote:
If $$x > 0$$ and $$x^2 = 161$$, what is the best whole number approximation of $$x$$?

(A) 13
(B) 18
(C) 41
(D) 80
(E) 2,560

Project PS Butler : Question #38

HKD1710 what if you dont indicate difficulty level in butler questions and reveal the difficulty of question when OA is published I think it will be more interesting
Retired Moderator
Joined: 22 Jun 2014
Posts: 1093
Location: India
Concentration: General Management, Technology
GMAT 1: 540 Q45 V20
GPA: 2.49
WE: Information Technology (Computer Software)
Re: If x > 0 and x^2 = 161, what is the best whole number approximation of  [#permalink]

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24 Nov 2018, 10:38
2
Hi dave13,

First of all Difficulty is calculated automatically on the basis of results of a number of attempts on a particular question. You can see it in the timer statics (only after a certain number of attempts has been made).

Now, To post a question, one of the difficulty level must be tagged.

Simple solution for you - Just click on "Hide Tags" on any question opened in the browser. So next time when you click on question URL from the butler project page or anywhere, you will not see the tags. When you need to see tags just click on "Show Tags".

Hope it helps
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Re: If x > 0 and x^2 = 161, what is the best whole number approximation of   [#permalink] 24 Nov 2018, 10:38
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