GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 19 Aug 2018, 00:44

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

Given x = y + z. Is x > y ? 1) y > 0 2) z > 0

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

Hide Tags

DS Forum Moderator
User avatar
P
Joined: 27 Oct 2017
Posts: 675
Location: India
Concentration: International Business, General Management
GPA: 3.64
WE: Business Development (Energy and Utilities)
Premium Member CAT Tests
Given x = y + z. Is x > y ? 1) y > 0 2) z > 0  [#permalink]

Show Tags

New post 15 Jun 2018, 10:21
1
3
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

55% (00:58) correct 45% (00:49) wrong based on 53 sessions

HideShow timer Statistics

CEO
CEO
User avatar
D
Joined: 12 Sep 2015
Posts: 2706
Location: Canada
Re: Given x = y + z. Is x > y ? 1) y > 0 2) z > 0  [#permalink]

Show Tags

New post 15 Jun 2018, 10:43
Top Contributor
gmatbusters wrote:
Given x = y + z. Is x > y ?

1) y > 0
2) z > 0


Great question!

Given: Given x = y + z

Target question: Is x > y ?
This is a good candidate for rephrasing the target question.

Aside: the video below has tips on rephrasing the target question

Take x > y, and subtract y from both sides to get: x - y > 0
So, asking Is x > y? is the SAME AS asking Is x - y > 0?

REPHRASED target question: Is x - y >?

Statement 1: y > 0
There are several values of x, y and z that satisfy statement 1. Here are two:
Case a: x = 3, y = 2 and z = 1 (this satisfies the given condition that x = y + z. In this case, x - y = 3 - 2 = 1. So, the answer to the REPHRASED target question is YES, x - y IS greater than 0
Case b: x = 2, y = 3 and z = -1 (this satisfies the given condition that x = y + z. In this case, x - y = 2 - 3 = -1. So, the answer to the REPHRASED target question is NO, x - y is NOT greater than 0
Since we cannot answer the REPHRASED target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: z > 0
It's given that x = y + z
This means that x - y = z
Since statement 1 tells us that z > 0, then it is the case that x - y > 0
PERFECT!!
The answer to the REPHRASED target question is YES, x - y IS greater than 0
Since we can answer the REPHRASED target question with certainty, statement 2 is SUFFICIENT

Answer: B

Cheers,
Brent

RELATED VIDEO

_________________

Brent Hanneson – Founder of gmatprepnow.com

Image

Manager
Manager
User avatar
B
Joined: 07 Feb 2017
Posts: 170
Re: Given x = y + z. Is x > y ? 1) y > 0 2) z > 0  [#permalink]

Show Tags

New post 15 Jun 2018, 12:31
Is y + z > y ?
Is z > 0 ?
Statement 2 is Sufficient
Answer B
DS Forum Moderator
User avatar
P
Joined: 27 Oct 2017
Posts: 675
Location: India
Concentration: International Business, General Management
GPA: 3.64
WE: Business Development (Energy and Utilities)
Premium Member CAT Tests
Re: Given x = y + z. Is x > y ? 1) y > 0 2) z > 0  [#permalink]

Show Tags

New post 24 Jul 2018, 02:28
1
x = y + z

or, x-y = z

Question is x > y?

This translates to is x – y>0

or, z>0

1) Y>0

Not sufficient.

2) Z>0

Hence Statement 2 is sufficient .

Answer B
_________________

SC: Confusable words
All you need for Quant, GMAT PS Question Directory,GMAT DS Question Directory
Error log/Key Concepts
Combination Concept: Division into groups
Question of the Day (QOTD)
Free GMAT CATS

Re: Given x = y + z. Is x > y ? 1) y > 0 2) z > 0 &nbs [#permalink] 24 Jul 2018, 02:28
Display posts from previous: Sort by

Given x = y + z. Is x > y ? 1) y > 0 2) z > 0

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

Events & Promotions

PREV
NEXT


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| 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®.