It is currently 23 Jan 2018, 10:11

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Which of the following statements is true?

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

Hide Tags

GMAT Club team member
avatar
Joined: 16 Mar 2009
Posts: 113
Location: Bologna, Italy
Which of the following statements is true? [#permalink]

Show Tags

New post 27 Aug 2010, 07:15
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

39% (01:56) correct 61% (01:32) wrong based on 75 sessions

HideShow timer Statistics

Which of the following statements is true?

A. \(3\sqrt{7}<2\sqrt{15}<\frac{5\sqrt{13}}{sqrt{5}}<\frac{39}{5}\)

B. \(2\sqrt{15}<\frac{39}{5}<3\sqrt{7}<\frac{5\sqrt{13}}{sqrt{5}}\)

C. \(2\sqrt{15}<3\sqrt{7}<\frac{39}{5}<\frac{5\sqrt{13}}{sqrt{5}}\)

D. \(2\sqrt{15}<3\sqrt{7}<\frac{5\sqrt{13}}{sqrt{5}}<\frac{39}{5}\)

E. \(2\sqrt{15}<\frac{5\sqrt{13}}{sqrt{5}}<3\sqrt{7}<\frac{39}{5}\)
[Reveal] Spoiler: OA

_________________

My Recent Posts:
All GMAT CAT Practice Tests - links, prices, reviews
Master thread - GMAT Prep classes links to reviews and ratings
Review: GMATPrep (GMAT Prep) & PowerPrep (Power Prep) Tests

Have trouble finding answers on this site? Ask me!

Manager
Manager
avatar
B
Joined: 20 Apr 2010
Posts: 244
Location: Hyderabad
WE 1: 4.6 years Exp IT prof
Reviews Badge CAT Tests
Re: Which of the following statements is true? [#permalink]

Show Tags

New post 27 Aug 2010, 08:06
Answer should be C

Make all the Fraction with same denominator that way it would be much easier as only one option lefts.....!!!!
_________________

I will give a Fight till the End

"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."
- Bernard Edmonds

A person who is afraid of Failure can never succeed -- Amneet Padda

Don't Forget to give the KUDOS

Manager
Manager
avatar
Joined: 26 Mar 2010
Posts: 116
Re: Which of the following statements is true? [#permalink]

Show Tags

New post 14 Sep 2010, 04:18
any quick way to solve this plsss...???
Senior Manager
Senior Manager
avatar
Status: GMAT Time...!!!
Joined: 03 Apr 2010
Posts: 291
Schools: Chicago,Tuck,Oxford,cambridge
Re: Which of the following statements is true? [#permalink]

Show Tags

New post 14 Sep 2010, 09:54
utin wrote:
any quick way to solve this plsss...???


hi,
By observing carefully we can see that all answer choice compare 4 different value types of which 3 are in some form of sqrt......

well for a question like this strategy should be to take all the value inside square root and then compare each..

39/5 will be approx 8 which will be sqrt of 64 and then u can compare all the values easily.......

hope it helps u

thanx
Senior Manager
Senior Manager
avatar
Joined: 20 Jul 2010
Posts: 253
GMAT ToolKit User Reviews Badge
Re: Which of the following statements is true? [#permalink]

Show Tags

New post 14 Sep 2010, 11:50
sandeep800 wrote:
utin wrote:
any quick way to solve this plsss...???


hi,
By observing carefully we can see that all answer choice compare 4 different value types of which 3 are in some form of sqrt......

well for a question like this strategy should be to take all the value inside square root and then compare each..

39/5 will be approx 8 which will be sqrt of 64 and then u can compare all the values easily.......

hope it helps u

thanx


Nice idea. I was going decimal route which will be bad.
_________________

If you like my post, consider giving me some KUDOS !!!!! Like you I need them

Senior Manager
Senior Manager
avatar
Status: GMAT Time...!!!
Joined: 03 Apr 2010
Posts: 291
Schools: Chicago,Tuck,Oxford,cambridge
Re: Which of the following statements is true? [#permalink]

Show Tags

New post 14 Sep 2010, 11:56
saxenashobhit wrote:
sandeep800 wrote:
utin wrote:
any quick way to solve this plsss...???


hi,
By observing carefully we can see that all answer choice compare 4 different value types of which 3 are in some form of sqrt......

well for a question like this strategy should be to take all the value inside square root and then compare each..

39/5 will be approx 8 which will be sqrt of 64 and then u can compare all the values easily.......

hope it helps u

thanx


Nice idea. I was going decimal route which will be bad.


Thanx shobhit..sometime pattern of answer choices gives us the way to solve!!! :)
1 KUDOS received
Manager
Manager
avatar
Status: Keep fighting!
Affiliations: IIT Madras
Joined: 31 Jul 2010
Posts: 220
WE 1: 2+ years - Programming
WE 2: 3+ years - Product developement,
WE 3: 2+ years - Program management
Re: Which of the following statements is true? [#permalink]

Show Tags

New post 14 Sep 2010, 18:30
1
This post received
KUDOS
B. you have to be careful while doing such approximations.

If you bring everything under a squareroot it becomes obvious.

so it becomes sqrt(63), sqrt(60), sqrt(65), [39/5=sqrt(7.8*7.8) = sqrt(60.84)]

You should be careful while thinking of 7.8 as 8... just watch out ...coz in this case if you would get B as the answer. Not C.
Senior Manager
Senior Manager
avatar
Status: GMAT Time...!!!
Joined: 03 Apr 2010
Posts: 291
Schools: Chicago,Tuck,Oxford,cambridge
Re: Which of the following statements is true? [#permalink]

Show Tags

New post 14 Sep 2010, 20:23
hemanthp wrote:
B. you have to be careful while doing such approximations.

If you bring everything under a squareroot it becomes obvious.

so it becomes sqrt(63), sqrt(60), sqrt(65), [39/5=sqrt(7.8*7.8) = sqrt(60.84)]

You should be careful while thinking of 7.8 as 8... just watch out ...coz in this case if you would get B as the answer. Not C.

Thanx hemanth for pointing out that!!i actually dint solved the question..was just trying to tell the strategy we can use here....
Manager
Manager
avatar
Joined: 16 Aug 2009
Posts: 221
Re: Which of the following statements is true? [#permalink]

Show Tags

New post 15 Sep 2010, 08:40
hemanthp wrote:
B. you have to be careful while doing such approximations.

If you bring everything under a squareroot it becomes obvious.

so it becomes sqrt(63), sqrt(60), sqrt(65), [39/5=sqrt(7.8*7.8) = sqrt(60.84)]

You should be careful while thinking of 7.8 as 8... just watch out ...coz in this case if you would get B as the answer. Not C.


This is where i was stuck.
Thanks Hemanthp :)
2 KUDOS received
Senior Manager
Senior Manager
avatar
S
Joined: 02 Apr 2014
Posts: 353
Re: Which of the following statements is true? [#permalink]

Show Tags

New post 25 Dec 2017, 03:34
2
This post received
KUDOS
Squaring each term and then comparing makes life easy

\((3 \sqrt{7})^2\) = \(9 * 7\) = \(63\)

\((2 \sqrt{15})^2\) = \(4 * 15\) = \(60\)

\((39/5)^2\) = 1521/25 = \(60.x\) (some decimal)

\((5 \sqrt{13} / \sqrt{5})^2\) = \(25 * 13 / 5\) = \(65\)

60 < 60.x < 63 < 65

Answer (B)
Re: Which of the following statements is true?   [#permalink] 25 Dec 2017, 03:34
Display posts from previous: Sort by

Which of the following statements is true?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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®.