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# (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:

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Manager
Joined: 11 Feb 2011
Posts: 122

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Updated on: 08 Oct 2017, 04:08
1
00:00

Difficulty:

35% (medium)

Question Stats:

63% (01:00) correct 38% (01:00) wrong based on 16 sessions

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***Warning!!! This question is not correctly formatted***

(24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:

A. 4 & 5
B. 5& 6
C. 6& 7
D. 7&8
E. 8&9

Proper version of this question is here: https://gmatclub.com/forum/1-2-1-2-lies ... 56267.html

Originally posted by AnkitK on 26 Jun 2011, 05:41.
Last edited by Bunuel on 08 Oct 2017, 04:08, edited 3 times in total.
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Joined: 26 May 2005
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26 Jun 2011, 06:23
AnkitK wrote:
(24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:
A.4 & 5
B.5& 6
C.6& 7
D.7&8
E.8&9

is it (24+ 5* sqrt 23) + ( 24 - 5*sqrt 23)?
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Joined: 26 May 2005
Posts: 531

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Updated on: 26 Jun 2011, 08:37
I doubt the OA or question .. Absolutely no clue how to is it between 7 & 8
unless the question is
sqrt[ (24+5sqrt(23)) + sqrt(24-5sqrt(23)) ]
then u square the equation

= sqrt[24 + 5sqrt(23) + 2(576-575) + 24 - 5sqrt(23)]
= sqrt(50)
= 5 sqrt(2)
= 5*1.414 = >7 and <8
ur better dont tell me that this is the question

Originally posted by sudhir18n on 26 Jun 2011, 08:28.
Last edited by sudhir18n on 26 Jun 2011, 08:37, edited 1 time in total.
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26 Jun 2011, 08:37
$$24 + 5 \sqrt{23} + 24 - 5 \sqrt{23}=48$$
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27 Jun 2011, 00:34
It's a more interesting question if it's a multiplication, though going by the answer choices, that's not what's intended. But if you're asked the value of:

$$(24 + 5\sqrt{23})(24 - 5\sqrt{23})$$

there's quite a nice solution using the difference of squares pattern twice:

$$(24 + 5\sqrt{23})(24 - 5\sqrt{23}) = 24^2 - (5^2)(23) = 24^2 - (25)(23) = 24^2 - (24+1)(24 - 1) = 24^2 - (24^2 - 1) = 1$$

As for the question in the original post, the expression is clearly equal to 48, so there must be some kind of mistake somewhere.
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Manager
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Joined: 08 Jan 2011
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27 Jun 2011, 10:45
fluke wrote:
$$24 + 5 \sqrt{23} + 24 - 5 \sqrt{23}=48$$

you are right fluke
I was shcocked why someone would post such a question
i couldn't even move my pen........
i wish my real gmat give this much easy questions.....
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WarLocK
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The War is oNNNNNNNNNNNNN for 720+
see my Test exp here http://gmatclub.com/forum/my-test-experience-111610.html
do not hesitate me giving kudos if you like my post.

Math Forum Moderator
Joined: 20 Dec 2010
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27 Jun 2011, 11:01
1
Warlock007 wrote:
fluke wrote:
$$24 + 5 \sqrt{23} + 24 - 5 \sqrt{23}=48$$

you are right fluke
I was shcocked why someone would post such a question
i couldn't even move my pen........
i wish my real gmat give this much easy questions.....

Amen!!!
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Manager
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27 Jun 2011, 11:05
fluke wrote:
Warlock007 wrote:
fluke wrote:
$$24 + 5 \sqrt{23} + 24 - 5 \sqrt{23}=48$$

you are right fluke
I was shcocked why someone would post such a question
i couldn't even move my pen........
i wish my real gmat give this much easy questions.....

Amen!!!

Dear Fluke if I get a 7XX score

just wish me lots of luck and hard work (that pays me off very well......... )
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WarLocK
_____________________________________________________________________________
The War is oNNNNNNNNNNNNN for 720+
see my Test exp here http://gmatclub.com/forum/my-test-experience-111610.html
do not hesitate me giving kudos if you like my post.

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27 Jun 2011, 11:11
Lets form a mutual 'good luck -wishing' society:)
All the very best dude!! .. I sincerely wish n pray that u get >7XX score
Manager
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27 Jun 2011, 11:29
sudhir18n wrote:
Lets form a mutual 'good luck -wishing' society:)
All the very best dude!! .. I sincerely wish n pray that u get >7XX score

Hey thanks a lot man

I wish i get the reason to throw a grand party to all you guys out there
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WarLocK
_____________________________________________________________________________
The War is oNNNNNNNNNNNNN for 720+
see my Test exp here http://gmatclub.com/forum/my-test-experience-111610.html
do not hesitate me giving kudos if you like my post.

Senior Manager
Joined: 08 Nov 2010
Posts: 356

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28 Jun 2011, 10:12
1
Hey Fluke - if you dont mind me asking.
In order to make the forum more efficient - we should remove uncompleted questions like that. dont we? Its a waste of time to read this question and stare for 2 min - not sure what im doing wrong...

I would be happy to know what you guys think about that as well.

**AnkitK - Its not something personal towards you - its just that its wasting time for a lot of people.

thanks.
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28 Jun 2011, 10:29
144144 wrote:
Hey Fluke - if you dont mind me asking.
In order to make the forum more efficient - we should remove uncompleted questions like that. dont we? Its a waste of time to read this question and stare for 2 min - not sure what im doing wrong...

I would be happy to know what you guys think about that as well.

**AnkitK - Its not something personal towards you - its just that its wasting time for a lot of people.

thanks.

144144:
I can understand your frustration!!! Sometimes the author is also not sure whether the question indeed contains error. The error may be in the source itself.

But, we can try to attach a warning in questions like this after few responders confirm presence of error.

thanks for the suggestion!!!
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Senior Manager
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28 Jun 2011, 10:32
great solution. this is why you are the chosen one i guess...

have a good day.
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Manager
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28 Jun 2011, 10:37
fluke wrote:
144144 wrote:
Hey Fluke - if you dont mind me asking.
In order to make the forum more efficient - we should remove uncompleted questions like that. dont we? Its a waste of time to read this question and stare for 2 min - not sure what im doing wrong...

I would be happy to know what you guys think about that as well.

**AnkitK - Its not something personal towards you - its just that its wasting time for a lot of people.

thanks.

144144:
I can understand your frustration!!! Sometimes the author is also not sure whether the question indeed contains error. The error may be in the source itself.

But, we can try to attach a warning in questions like this after few responders confirm presence of error.

thanks for the suggestion!!!

Great help fluke
that will save a lot of valuable time
as almost all of us come here for quality material which can enrich our knowledge of the subject..
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WarLocK
_____________________________________________________________________________
The War is oNNNNNNNNNNNNN for 720+
see my Test exp here http://gmatclub.com/forum/my-test-experience-111610.html
do not hesitate me giving kudos if you like my post.

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Joined: 22 May 2016
Posts: 1759

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07 Oct 2017, 12:53
AnkitK wrote:
***Warning!!! This question is not correctly formatted***

(24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:

A. 4 & 5
B. 5& 6
C. 6& 7
D. 7&8
E. 8&9

Moderators, I ask respectfully while utterly bewildered:

WHAT is this question still doing here? See above posts, especially here

How does posting a warning help when the answer choices are not correct?

If this is a teachable moment, I just flunked.

Is there the equivalent of a shredder into which this question could go?
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Joined: 02 Sep 2009
Posts: 46291

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08 Oct 2017, 04:07
1
genxer123 wrote:
AnkitK wrote:
***Warning!!! This question is not correctly formatted***

(24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:

A. 4 & 5
B. 5& 6
C. 6& 7
D. 7&8
E. 8&9

Moderators, I ask respectfully while utterly bewildered:

WHAT is this question still doing here? See above posts, especially here

How does posting a warning help when the answer choices are not correct?

If this is a teachable moment, I just flunked.

Is there the equivalent of a shredder into which this question could go?

Thank you. You are right.

Proper version of this question is here: https://gmatclub.com/forum/1-2-1-2-lies ... 56267.html

LOCKING THE TOPIC.
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Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:   [#permalink] 08 Oct 2017, 04:07
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