GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 25 Sep 2018, 10:07

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

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

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Manager
Joined: 11 Feb 2011
Posts: 120
(24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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

Difficulty:

25% (medium)

Question Stats:

75% (01:41) correct 25% (03:02) wrong based on 16 sessions

### HideShow timer Statistics

***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.
Current Student
Joined: 26 May 2005
Posts: 522
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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)?
Current Student
Joined: 26 May 2005
Posts: 522
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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.
Retired Moderator
Joined: 20 Dec 2010
Posts: 1868
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

26 Jun 2011, 08:37
$$24 + 5 \sqrt{23} + 24 - 5 \sqrt{23}=48$$
_________________
GMAT Tutor
Joined: 24 Jun 2008
Posts: 1344
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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.
_________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

Manager
Status: ==GMAT Ninja==
Joined: 08 Jan 2011
Posts: 210
Schools: ISB, IIMA ,SP Jain , XLRI
WE 1: Aditya Birla Group (sales)
WE 2: Saint Gobain Group (sales)
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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.....
_________________

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.

Retired Moderator
Joined: 20 Dec 2010
Posts: 1868
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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!!!
_________________
Manager
Status: ==GMAT Ninja==
Joined: 08 Jan 2011
Posts: 210
Schools: ISB, IIMA ,SP Jain , XLRI
WE 1: Aditya Birla Group (sales)
WE 2: Saint Gobain Group (sales)
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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

your party is through man.......

just wish me lots of luck and hard work (that pays me off very well......... )
_________________

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.

Current Student
Joined: 26 May 2005
Posts: 522
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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
Status: ==GMAT Ninja==
Joined: 08 Jan 2011
Posts: 210
Schools: ISB, IIMA ,SP Jain , XLRI
WE 1: Aditya Birla Group (sales)
WE 2: Saint Gobain Group (sales)
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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
_________________

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: 347
WE 1: Business Development
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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.
_________________
Retired Moderator
Joined: 20 Dec 2010
Posts: 1868
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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!!!
_________________
Senior Manager
Joined: 08 Nov 2010
Posts: 347
WE 1: Business Development
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

28 Jun 2011, 10:32
great solution. this is why you are the chosen one i guess...

have a good day.
_________________
Manager
Status: ==GMAT Ninja==
Joined: 08 Jan 2011
Posts: 210
Schools: ISB, IIMA ,SP Jain , XLRI
WE 1: Aditya Birla Group (sales)
WE 2: Saint Gobain Group (sales)
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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..
_________________

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 SC Moderator
Joined: 22 May 2016
Posts: 1981
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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?
_________________

In the depths of winter, I finally learned
that within me there lay an invincible summer.

Math Expert
Joined: 02 Sep 2009
Posts: 49496
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between:  [#permalink]

### Show Tags

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.
_________________
Re: (24+5*(23)^1/2)+(24-5*(23)^1/2) lies between: &nbs [#permalink] 08 Oct 2017, 04:07
Display posts from previous: Sort by

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

 post reply Question banks Downloads My Bookmarks Reviews Important topics

## Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.