It is currently 22 Nov 2017, 04:27

### 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 the ratio x: y:z is 3:5:7, what is the value of z

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

### Hide Tags

Intern
Joined: 24 Nov 2012
Posts: 24

Kudos [?]: 60 [0], given: 0

If the ratio x: y:z is 3:5:7, what is the value of z [#permalink]

### Show Tags

29 Nov 2012, 09:56
5
This post was
BOOKMARKED
00:00

Difficulty:

15% (low)

Question Stats:

76% (00:35) correct 24% (00:43) wrong based on 106 sessions

### HideShow timer Statistics

If the ratio x: y:z is 3:5:7, what is the value of z?

(1) The average (arithmetic mean) of x, y, and z is 25.
(2) The value of x is 15.
[Reveal] Spoiler: OA

Last edited by Bunuel on 19 Mar 2015, 05:38, edited 2 times in total.
Edited the tags.

Kudos [?]: 60 [0], given: 0

Director
Status: Tutor - BrushMyQuant
Joined: 05 Apr 2011
Posts: 617

Kudos [?]: 798 [0], given: 59

Location: India
Concentration: Finance, Marketing
Schools: XLRI (A)
GMAT 1: 700 Q51 V31
GPA: 3
WE: Information Technology (Computer Software)
Re: If the ratio x: y:z is 3:5:7, what is the value of z [#permalink]

### Show Tags

29 Nov 2012, 10:01
ritumaheshwari02 wrote:
If the ratio x: y:z is 3:5:7, what is the value of z?

(1) The average (arithmetic mean) of x, y, and z is 25.
(2) The value of x is 15.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

OFFICIAL ANSWER IS NOT PROVIDED.

x:y:z = 3:5:7
means x=3k, y=5k, z=7k where k is the common value in all the three numbers.

STAT1
(x+y+z)/3 = 25
x+y+z = 75
=> 3k + 5k+ 7k = 75
15k = 75
k = 5
z = 7k = 35
SUFFICIENT

STAT2
x= 15
=> 3k = 15
=> k =5
=> z = 7k = 7*5 = 35
SUFFICIENT

Answer will be D
Hope it helps!
_________________

Ankit

Check my Tutoring Site -> Brush My Quant

GMAT Quant Tutor
How to start GMAT preparations?
How to Improve Quant Score?
Gmatclub Topic Tags
Check out my GMAT debrief

How to Solve :
Statistics || Reflection of a line || Remainder Problems || Inequalities

Kudos [?]: 798 [0], given: 59

Non-Human User
Joined: 09 Sep 2013
Posts: 15565

Kudos [?]: 283 [0], given: 0

Re: If the ratio x: y:z is 3:5:7, what is the value of z [#permalink]

### Show Tags

17 Mar 2015, 06:06
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

Kudos [?]: 283 [0], given: 0

EMPOWERgmat Instructor
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 10158

Kudos [?]: 3530 [0], given: 173

Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: 340 Q170 V170
Re: If the ratio x: y:z is 3:5:7, what is the value of z [#permalink]

### Show Tags

18 Mar 2015, 20:04
Hi All,

With the given ratio, we know that X is a multiple of 3, Y is an equivalent multiple of 5 and Z is an equivalent multiple of 7. By extension, the sum of those 3 terms is a multiple of 15

For example, we could have X=3, Y=5 and Z=7 (and the sum = 15) or X=6, Y=10, Z=14 (and the sum = 30)

We're asked for the value of Z .

Fact 1: The average (arithmetic mean) of x, y, and z is 25.

Since the average of the 3 terms is 25, the SUM of the three terms is 75.

75 is a 5 times 15, so we can calculate the value of all 3 variables:

X = 3(5) = 15
Y = 5(5) = 25
Z = 7(5) = 35
Fact 1 is SUFFICIENT

Fact 2: The value of x is 15.

Since X = 15, we can figure out the "multiple of 3" that we're dealing with. 3(5) = 15, so we have to multiply the Y and the Z by 5 also.

Y = 5(5) = 25
Z = 7(5) = 35
Fact 2 is SUFFICIENT

[Reveal] Spoiler:
D

GMAT assassins aren't born, they're made,
Rich
_________________

760+: Learn What GMAT Assassins Do to Score at the Highest Levels
Contact Rich at: Rich.C@empowergmat.com

# Rich Cohen

Co-Founder & GMAT Assassin

Special Offer: Save \$75 + GMAT Club Tests Free
Official GMAT Exam Packs + 70 Pt. Improvement Guarantee
www.empowergmat.com/

***********************Select EMPOWERgmat Courses now include ALL 6 Official GMAC CATs!***********************

Kudos [?]: 3530 [0], given: 173

Non-Human User
Joined: 09 Sep 2013
Posts: 15565

Kudos [?]: 283 [0], given: 0

Re: If the ratio x: y:z is 3:5:7, what is the value of z [#permalink]

### Show Tags

18 Sep 2016, 22:47
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

Kudos [?]: 283 [0], given: 0

Re: If the ratio x: y:z is 3:5:7, what is the value of z   [#permalink] 18 Sep 2016, 22:47
Display posts from previous: Sort by

# If the ratio x: y:z is 3:5:7, what is the value of z

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

 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®.