BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

help me to solve it............

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 1179
Joined: Sun Apr 11, 2010 9:07 pm
Location: Milpitas, CA
Thanked: 447 times
Followed by:88 members

by Rahul@gurome » Wed Sep 29, 2010 11:38 pm
Now xy : yz : zx = xy/xyz : yz/xyz : zx/xyz = 1/z : 1/x : 1/y = 1 : 2 : 3.
We need to know x/yz : y/zx = (x/yz)*xyz : (y/zx)*xyz = x^2 : y^2.
Since 1/z : 1/x : 1/y = 1 : 2 : 3, 1/x : 1/y = 2:3.
So x:y is 3:2.
Or x^2 : y^2 = 9:4.

The correct answer is D.
Rahul Lakhani
Quant Expert
Gurome, Inc.
https://www.GuroMe.com
On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 261
Joined: Wed Mar 31, 2010 8:37 pm
Location: Varanasi
Thanked: 11 times
Followed by:3 members

by ankur.agrawal » Thu Sep 30, 2010 2:08 am
Is dere any general strategy to solve dese type of questions
Top
User avatar
GMAT Instructor
Posts: 15539
Joined: Tue May 25, 2010 12:04 pm
Location: New York, NY
Thanked: 13060 times
Followed by:1906 members
GMAT Score:790

by GMATGuruNY » Thu Sep 30, 2010 2:33 am
pzazz12 wrote:If xy : yz : zx = 1 : 2 : 3 then x / yz : y / zx =

A. 1 : 4
B. 1 : 2
C. 3 : 2
D. 9 : 4
E. 3 : 8
A quick and safe approach would be to plug in values:

xy:yz = 1:2, so x:z = 1:2
yz:zx = 2:3, so y: x = 2:3

Let's plug in x=3, y=2, z=6.

x/yz : y/zx = 3/(2*6) : 2/(6*3) = 1/4 : 1/9 = 9:4.

The correct answer is D.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.

As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.

For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 261
Joined: Wed Mar 31, 2010 8:37 pm
Location: Varanasi
Thanked: 11 times
Followed by:3 members

by ankur.agrawal » Thu Sep 30, 2010 2:58 am
GMATGuruNY wrote:
pzazz12 wrote:If xy : yz : zx = 1 : 2 : 3 then x / yz : y / zx =

A. 1 : 4
B. 1 : 2
C. 3 : 2
D. 9 : 4
E. 3 : 8
A quick and safe approach would be to plug in values:

xy:yz = 1:2, so x:z = 1:2
yz:zx = 2:3, so y: x = 2:3

Let's plug in x=3, y=2, z=6.

x/yz : y/zx = 3/(2*6) : 2/(6*3) = 1/4 : 1/9 = 9:4.

The correct answer is D.
Thanx again guru. Plugging in saved us yet again.
Top
Master | Next Rank: 500 Posts
Posts: 155
Joined: Wed Sep 22, 2010 3:54 am
Thanked: 6 times

by pzazz12 » Fri Oct 01, 2010 4:25 am
GMATGuruNY wrote:
pzazz12 wrote:If xy : yz : zx = 1 : 2 : 3 then x / yz : y / zx =

A. 1 : 4
B. 1 : 2
C. 3 : 2
D. 9 : 4
E. 3 : 8
A quick and safe approach would be to plug in values:

xy:yz = 1:2, so x:z = 1:2
yz:zx = 2:3, so y: x = 2:3

Let's plug in x=3, y=2, z=6.

x/yz : y/zx = 3/(2*6) : 2/(6*3) = 1/4 : 1/9 = 9:4.

The correct answer is D.

thank u very much..........
Top
Post new topic Post Reply
• Page 1 of 1