It is currently 16 Jan 2018, 09:44

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

simplify

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Director
Director
User avatar
Joined: 25 Oct 2008
Posts: 592

Kudos [?]: 1232 [0], given: 100

Location: Kolkata,India
simplify [#permalink]

Show Tags

New post 09 Jun 2009, 19:33
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If x = 4 and y = 16, then sq. root of (x+y/xy) is closest to which of the following ?

(A) 1/3
(B) 1/2
(C) 3/4
(D)7/8
(E) 1

[spoiler]OA:B[/spoiler]

Ok so i got stuck in the last step.Simplified and got sq root of 5/4.Now what if I have no clue of wat the value of sq root of 5 is?My ans was C because i know sq root of 4 is 2.So sq root of 5 should be a value 2+.I already have the denominator as 4.So C.CLearly the logic is wrong.
_________________

http://gmatclub.com/forum/countdown-beginshas-ended-85483-40.html#p649902

Kudos [?]: 1232 [0], given: 100

Current Student
User avatar
Joined: 03 Aug 2006
Posts: 115

Kudos [?]: 320 [0], given: 3

Location: Next to Google
Schools: Haas School of Business
Re: simplify [#permalink]

Show Tags

New post 09 Jun 2009, 22:03
I think you were on the right track. For me I have memorized the sqrt of 2,3 and 5. The sqrt of 5 is 2.25. Hence answer is

\(\frac{2.25}{4} = \frac{9}{16}\)

which is closer to 1/2

Kudos [?]: 320 [0], given: 3

Manager
Manager
avatar
Joined: 28 Jan 2004
Posts: 201

Kudos [?]: 30 [0], given: 4

Location: India
Re: simplify [#permalink]

Show Tags

New post 09 Jun 2009, 22:42
Just another way to look at it is....

by substituting X and Y we get .. Sqrt(5/16). Instead of performing square root of this , i will square the answer choices as squaring is easy.

1/3 give 1/9
1/2 gives 1/4
3/4 gives 9/16
7/8 gives 49/64
1 gives 1.

9/16 is closed to 5/16. So this should be answer. I am sure out of 5 atleast 3 will be definetly no-no for remianign 2 (if requird)you can perform a actual divide. This takes less time.

Kudos [?]: 30 [0], given: 4

Director
Director
User avatar
Joined: 25 Oct 2008
Posts: 592

Kudos [?]: 1232 [0], given: 100

Location: Kolkata,India
Re: simplify [#permalink]

Show Tags

New post 21 Jun 2009, 02:59
mdfrahim:i liked your approach but the OA is (b) not (c).NOW how do you explain?
_________________

http://gmatclub.com/forum/countdown-beginshas-ended-85483-40.html#p649902

Kudos [?]: 1232 [0], given: 100

Senior Manager
Senior Manager
avatar
Joined: 08 Jan 2009
Posts: 324

Kudos [?]: 191 [0], given: 5

Re: simplify [#permalink]

Show Tags

New post 21 Jun 2009, 08:25
Agree with B

by substituting X and Y we get .. Sqrt(5/16) or 1/4 by Sqrt(5)

1/4 Sqrt(4) = 1/2 and 1/4 Sqrt(9) = 3/4 .

So our answer lie b/w this.

Scanning through the choice u will see A,D, E are out since outside our range.

Then among B and C . Definetly ours is closer to B.

Kudos [?]: 191 [0], given: 5

Intern
Intern
avatar
Joined: 04 Mar 2008
Posts: 42

Kudos [?]: 3 [0], given: 6

Re: simplify [#permalink]

Show Tags

New post 22 Jun 2009, 15:56
tejal777 wrote:
If x = 4 and y = 16, then sq. root of (x+y/xy) is closest to which of the following ?

(A) 1/3
(B) 1/2
(C) 3/4
(D)7/8
(E) 1

[spoiler]OA:B[/spoiler]

Ok so i got stuck in the last step.Simplified and got sq root of 5/4.Now what if I have no clue of wat the value of sq root of 5 is?My ans was C because i know sq root of 4 is 2.So sq root of 5 should be a value 2+.I already have the denominator as 4.So C.CLearly the logic is wrong.



looks like you just missed the last step of the calculation.

Kudos [?]: 3 [0], given: 6

Re: simplify   [#permalink] 22 Jun 2009, 15:56
Display posts from previous: Sort by

simplify

  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®.