Last visit was: 08 May 2026, 17:18 It is currently 08 May 2026, 17:18
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
User avatar
jamesrwright3
User avatar
Joined: 08 May 2004
Last visit: 26 Apr 2007
Posts: 135
Own Kudos:
2
Location: Pittsburgh
Posts: 135
Kudos: 2
Trouble With Root Problems...Any Link to Tutorials? 19 Nov 2006, 16:01
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I am having trouble with these types of questions. I could not find a method in any of my GMAT material, and Manhattan GMAT's guide said these types of problems are not solvable? Here is an example

What is the value of n if n(root3)= 4(Root75)+5(Root48)

A. 20(root3)
B. 10
C. 40
D. 20
E. None of the above

Ok doing it long ways,

Simpifying the right side I get Sqrt (75*16)+Sqrt (25*48)
Combining numbers on that side, that equals Sqrt2400

I was told the answer to the question is 40. However, if if Square 40 and multiply it by the number inside of the root sign, I get sqrt4800?

I am confused

Anyone have any links which can help?

Thanks

Jim



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
mbagal1
User avatar
Joined: 28 Dec 2005
Last visit: 12 Oct 2010
Posts: 693
Own Kudos:
108
Posts: 693
Kudos: 108
Trouble With Root Problems...Any Link to Tutorials? 19 Nov 2006, 16:22
Kudos
Add Kudos
Bookmarks
Bookmark this Post
This is the way I do it:

75 = 5x5x3
=>root(75) = 5root(3)
48 = 2x2x2x2x3
=> root(48) = 4root(3)

=> 4Root(75)+5Root(48) = 20root(3) + 20 root(3)
= 40root(3)
User avatar
MBAlad
User avatar
Joined: 20 Feb 2006
Last visit: 18 Jan 2007
Posts: 184
Own Kudos:
92
Posts: 184
Kudos: 92
Trouble With Root Problems...Any Link to Tutorials? 19 Nov 2006, 16:29
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I cant give you any links just search the maths section of the forum and you should find quite a few.

The way I'd approach it is

What is the value of n if n(root3)= 4(Root75)+5(Root48)

n(root3) = 4(root 3 * 25) + 5(root 3*16)
n(root3) = 4*5(root3) + 5*4(root3)
n(root3) = 20(root3) + 20(root3)
n(root3) = 40(root3)
divide both sides by root3 ---> n=40



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!