Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
May 1810:00 AM PDT
-11:00 AM PDT
Join us in a live GMAT practice session and solve 25 challenging GMAT questions with other test takers in timed conditions, covering GMAT Quant, Data Sufficiency, Data Insights, Reading Comprehension, and Critical Reasoning questions.
May 1212:00 PM EDT
-11:59 PM EDT
Make the most of your break with the most realistic GMAT™ prep. Take up to $700 off select products. Ends 6/1
May 1501:00 PM IST
-11:00 AM IST
Start your journey with a fully customized action plan and work with a dedicated mentor to achieve a 735+ score.- May 19
12:00 PM PDT
-01:00 PM PDT
Scoring 329 on the GRE is not always about using more books, more courses, or a longer study plan. In this episode of GRE Success Talks, Ashutosh shares his GRE preparation strategy, study plan, and test-day experience, explaining how he kept his prep.... - Jun 10
06:00 AM PDT
-06:15 PM PDT
Register for the GMAT Club Virtual MBA Spotlight Fair – the world’s premier event for serious MBA candidates. This is your chance to hear directly from Admissions Directors at nearly every Top 30 MBA program..
04 Jun 2022, 07:51
Kudos
Bookmarks
My 2 cents on this:
Practically, I am always weary of using numbers with so many variables involved. So, like others have done, I also solved it through Algebra. Here's how:
From given, we know that x+y+z>0 --> x+y> -z or that z> -x -y
St 1:
x +y + 1 < z --> z> -x - y
OK. if we add our given equation? Let's see
z> - x -y
z> x + y + 1
------------------
2z> 1
z>1/2, Which means z COULD be greater than but not definitely. Hence insufficient.
St 2: x + y < -1 ---> -x - y > 1
OK. lets add the given equation again.
- x - y > 1
x + y + z > 0
------------------
z> 1
Sufficient! Answer is B
Practically, I am always weary of using numbers with so many variables involved. So, like others have done, I also solved it through Algebra. Here's how:
From given, we know that x+y+z>0 --> x+y> -z or that z> -x -y
St 1:
x +y + 1 < z --> z> -x - y
OK. if we add our given equation? Let's see
z> - x -y
z> x + y + 1
------------------
2z> 1
z>1/2, Which means z COULD be greater than but not definitely. Hence insufficient.
St 2: x + y < -1 ---> -x - y > 1
OK. lets add the given equation again.
- x - y > 1
x + y + z > 0
------------------
z> 1
Sufficient! Answer is B
03 Oct 2022, 09:35
Kudos
Bookmarks
KarishmaB
Thank you for your helpful response!
To clarify on Bunuel's explanation at the start of this form, "You can only apply subtraction when their signs are in the opposite directions:
If a>ba>b and c<dc<d (signs in opposite direction: >> and <<) --> a−c>b−da−c>b−d (take the sign of the inequality you subtract from).
Example: 3<43<4 and 5>15>1 --> 3−5<4−13−5<4−1 ." I thought that you were not allowed to subtract nor divide inequalities? Why does Bunuel show how to subtract inequalities here?
Thank you
KarishmaB
05 Oct 2022, 02:54
Kudos
Bookmarks
woohoo921
You can subtract/divide inequalities as long as you understand the constraints under which these operations are valid.
For Subtraction, the inequalities should have opposite signs and the result will take the sign of the first inequality.
a < b
c > d
-------
a - c < b - d
For Division, the inequalities should have opposite signs, both sides of both inequalities should be non negative and there should be no 0 in the denominator post division. Otherwise the result is inconclusive.
If a, b, c and d are positive numbers,
a < b
c > d
---------
a/c < b/d
