If xy = 2, xz = 8, and yz = 5, then the value of xyz is : GMAT Problem Solving (PS)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 22 Jan 2017, 22:35

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If xy = 2, xz = 8, and yz = 5, then the value of xyz is

Author Message
TAGS:

### Hide Tags

Intern
Joined: 22 Mar 2013
Posts: 11
Followers: 0

Kudos [?]: 0 [0], given: 15

If xy = 2, xz = 8, and yz = 5, then the value of xyz is [#permalink]

### Show Tags

27 Jun 2013, 13:12
00:00

Difficulty:

25% (medium)

Question Stats:

81% (01:39) correct 19% (01:20) wrong based on 48 sessions

### HideShow timer Statistics

If xy = 2, xz = 8, and yz = 5, then the value of xyz is closest to:

A. 5
B. 9
C. 15
D. 25
E. 75

My question is, why are there not two solutions to the problem?
I see that (x^2)(y^2)(z^2) = 80.

[Reveal] Spoiler: OA

Last edited by Bunuel on 27 Jun 2013, 13:22, edited 3 times in total.
Edited the question and moved to PS forum.
Math Expert
Joined: 02 Sep 2009
Posts: 36601
Followers: 7098

Kudos [?]: 93487 [1] , given: 10563

Re: If xy = 2 , xz = 8 , and yz = 5, then the value of xyz is [#permalink]

### Show Tags

27 Jun 2013, 13:26
1
KUDOS
Expert's post
tmipanthers wrote:
If xy = 2, xz = 8, and yz = 5, then the value of xyz is closest to:

A. 5
B. 9
C. 15
D. 25
E. 75

My question is, why are there not two solutions to the problem?
I see that (x^2)(y^2)(z^2) = 80.

You are not making any error, xyz CAN be $$\sqrt{80}$$ as well as $$-\sqrt{80}$$.
_________________
Re: If xy = 2 , xz = 8 , and yz = 5, then the value of xyz is   [#permalink] 27 Jun 2013, 13:26
Similar topics Replies Last post
Similar
Topics:
4 If X+Y = 2X-2Z, X-2Y = 4Z and X+Y+Z = 21, what is the value of Y/Z? 6 14 Jul 2016, 00:48
2 In XYZ, points M, N, and P are midpoints. If XY = 10, YZ = 15, and XZ 5 31 Jan 2016, 06:42
5 What is the value of x^2yz − xyz^2, if x = − 2, y = 1, and z = 3? 8 10 Jan 2016, 06:27
25 XYZ is a right angled triangle with YZ = 6cm and XY = 8cm. XZ is the h 7 31 Oct 2014, 06:43
6 If w=(1+x*y/z^2)(x+y), x=z/2, and y=3z/4, what is the value 10 08 Apr 2013, 03:25
Display posts from previous: Sort by