Forum Home > GMAT > Quantitative > Problem Solving (PS)
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.
Jan 2511:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test.
Jan 2410:00 AM EST
-12:00 PM EST
The Target Test Prep team is proud to introduce GMAT OnDemand, a video course created by Scott Woodbury-Stewart, founder and CEO, designed to provide you with everything you need to master the GMAT and achieve your score goals.
Jan 2410:00 AM EST
-11:59 PM EST
Through Friday, January 31, get an extra 25% off Target Test Prep GMAT plans. Just use the coupon code FLASH25 at checkout to save up to $400.- Jan 26
11:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease.
20 Feb 2014, 01:19
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
81% (01:25) correct
19%
(01:17)
wrong
based on 1729
sessions
History
Date
Time
Result
Not Attempted Yet
20 Feb 2014, 01:20
Kudos
Bookmarks
SOLUTION
If \(t\neq{0}\), is r greater than zero?
(1) rt = 12 --> if r=1 and t=12, then r>0 but if r=-1 and t=-12, then r<0. Not sufficient.
(2) r + t = 7 --> if r=1 and t=6, then r>0 but if r=-1 and t=8, then r<0. Not sufficient.
(1)+(2) From (2) t = 7- r, thus from (1) r(7-r) = 12 --> solving gives r=3 or r=4. In ether case r>0. Sufficient.
Answer: C.
If \(t\neq{0}\), is r greater than zero?
(1) rt = 12 --> if r=1 and t=12, then r>0 but if r=-1 and t=-12, then r<0. Not sufficient.
(2) r + t = 7 --> if r=1 and t=6, then r>0 but if r=-1 and t=8, then r<0. Not sufficient.
(1)+(2) From (2) t = 7- r, thus from (1) r(7-r) = 12 --> solving gives r=3 or r=4. In ether case r>0. Sufficient.
Answer: C.
General Discussion
20 Feb 2014, 04:08
Kudos
Bookmarks
If \(t\neq{0}\), is r greater than zero?
(1) rt = 12
(2) r + t = 7
1 - insufficient. If t<0 -> r<0, if t>0 -> r>0.
2 - insufficient. Could be r=-1 and t=8, or r=1 and t=6.
2 and 2:
\(r+\frac{12}{t}-7=0\)
\(r^2 -7r+12=0\)
\((r-1)(r-6)=0\)
So r=1 or 6. That are >0.
Ans C
(1) rt = 12
(2) r + t = 7
1 - insufficient. If t<0 -> r<0, if t>0 -> r>0.
2 - insufficient. Could be r=-1 and t=8, or r=1 and t=6.
2 and 2:
\(r+\frac{12}{t}-7=0\)
\(r^2 -7r+12=0\)
\((r-1)(r-6)=0\)
So r=1 or 6. That are >0.
Ans C
