It is currently 16 Dec 2017, 18:37

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

What is the value of x?

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

Hide Tags

Expert Post
1 KUDOS received
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42631

Kudos [?]: 135874 [1], given: 12715

What is the value of x? [#permalink]

Show Tags

New post 14 Apr 2015, 03:48
1
This post received
KUDOS
Expert's post
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

77% (00:46) correct 23% (00:32) wrong based on 96 sessions

HideShow timer Statistics

Kudos [?]: 135874 [1], given: 12715

Retired Moderator
avatar
Status: On a mountain of skulls, in the castle of pain, I sit on a throne of blood.
Joined: 30 Jul 2013
Posts: 360

Kudos [?]: 219 [0], given: 133

GMAT ToolKit User Reviews Badge CAT Tests
Re: What is the value of x? [#permalink]

Show Tags

New post 14 Apr 2015, 04:53
Bunuel wrote:
What is the value of x?

(1) 5x + 3y = 15
(2) y = 5 – (5/3)x


Kudos for a correct solution.


1. 5x+3y=15

Not Sufficient

2. 3y=15-5x
5x+3y=15

Not Sufficient

1 and 2:
Both equations are the same so there can be unlimited solutions.

Answer: E

Kudos [?]: 219 [0], given: 133

Manager
Manager
avatar
Joined: 17 Mar 2015
Posts: 121

Kudos [?]: 57 [0], given: 4

Re: What is the value of x? [#permalink]

Show Tags

New post 14 Apr 2015, 06:37
#1 - no info about y so we can't find x, insufficient
#2 - same thing. insufficient
#1 + #2.
Transforming 2nd equation into 3y+5x = 15 and noticing that whichever pair of (x;y) you choose to complete the equation #2, it will also complete the equation in #1 (coz they are equal afterall) thus making it impossible to determine the value of x.

Answer E

Kudos [?]: 57 [0], given: 4

Manager
Manager
avatar
Joined: 01 Jan 2015
Posts: 56

Kudos [?]: 3 [0], given: 7

Re: What is the value of x? [#permalink]

Show Tags

New post 14 Apr 2015, 08:56
St 1) 5x + 3y = 15 -> We get 2 values x=0 y=5 or y=0 x=3 so value of x can be 0 or 5 -> NS
St 2) y = 5 – (5/3)x -> solving this we get the same eq. as st 1's (5x + 3y = 15) so again two values of x 0 or 5 -> NS
Combining St1 and ST2 -> No unique solution!

Answer E

Kudos [?]: 3 [0], given: 7

1 KUDOS received
Rice (Jones) Thread Master
User avatar
B
Joined: 25 Feb 2014
Posts: 236

Kudos [?]: 94 [1], given: 147

GMAT 1: 720 Q50 V38
Premium Member Reviews Badge
Re: What is the value of x? [#permalink]

Show Tags

New post 14 Apr 2015, 08:57
1
This post received
KUDOS
(1) 5x + 3y = 15

Clearly insufficient.

(2) y = 5 – (5/3)x

Solve:
y/5= 1-x/3
x/3+y/5=1
therefore
5x+3y=15
This equation is same as equation 1)
So equation 1 and equation 2 are same and insufficient. So E
_________________

Consider KUDOS if my post helped :)

I got the eye of the tiger, a fighter, dancing through the fire
'Cause I am a champion and you're gonna hear me roar

Kudos [?]: 94 [1], given: 147

Senior Manager
Senior Manager
User avatar
Joined: 28 Feb 2014
Posts: 295

Kudos [?]: 145 [0], given: 133

Location: United States
Concentration: Strategy, General Management
Reviews Badge
Re: What is the value of x? [#permalink]

Show Tags

New post 14 Apr 2015, 09:16
(1) 5x + 3y = 15
no info is given on y
insufficient

(2) y = 5 – (5/3)x
If this expression is multiplied by 3, it is identical to statement 1
Insufficient

Answer : E

Kudos [?]: 145 [0], given: 133

Director
Director
avatar
G
Joined: 21 May 2013
Posts: 559

Kudos [?]: 54 [0], given: 506

CAT Tests
Re: What is the value of x? [#permalink]

Show Tags

New post 15 Apr 2015, 07:02
Bunuel wrote:
What is the value of x?

(1) 5x + 3y = 15
(2) y = 5 – (5/3)x


Kudos for a correct solution.


1. 5x+5y=15. Insufficient
2.y=5-(5/3)x
3y=15-5x. Insuffcient

Using both statements, data is still insufficient to find value of x
Answer E

Kudos [?]: 54 [0], given: 506

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42631

Kudos [?]: 135874 [0], given: 12715

Re: What is the value of x? [#permalink]

Show Tags

New post 20 Apr 2015, 05:30
Bunuel wrote:
What is the value of x?

(1) 5x + 3y = 15
(2) y = 5 – (5/3)x


Kudos for a correct solution.


MAGOOSH OFFICIAL SOLUTION

Since (1) is a linear equation with two variables, it will allow you to solve for x only in terms of y. So that statement is insufficient by itself, eliminate answers A and D. This leaves B, C, and E.

Since (2) is also a linear equation with two variables, it will allow you to solve for x only in terms of y. So that statement is insufficient by itself, eliminate B. This leaves C and E.

You might be tempted to choose C, because (1) and (2) together give you two linear equations with the same two variables. As we’ve seen though, we must first make sure that the two equations are distinct. To see whether they are in fact the same equation in different guises, rewrite one of them—say Statement (1)—in the form that other already has.

So let’s solve for y using (1).

5x + 3y = 15

Subtract 5x from each side.

3y=15-5x

Divide each side by 3.

y = 5 – (5/3)x

So (1) and (2) are in fact the same equation.

The correct answer is E.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 135874 [0], given: 12715

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 14813

Kudos [?]: 288 [0], given: 0

Premium Member
Re: What is the value of x? [#permalink]

Show Tags

New post 30 Oct 2017, 05:10
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.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Kudos [?]: 288 [0], given: 0

Re: What is the value of x?   [#permalink] 30 Oct 2017, 05:10
Display posts from previous: Sort by

What is the value of x?

  new topic 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®.