Find all School-related info fast with the new School-Specific MBA Forum

It is currently 01 Sep 2014, 20:35

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If zt < -3, is z < 4 ? (1) z < 9 (2) t < -4

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 14 Dec 2010
Posts: 220
Location: India
Concentration: Technology, Entrepreneurship
GMAT 1: 680 Q44 V39
Followers: 2

Kudos [?]: 21 [0], given: 5

GMAT Tests User
If zt < -3, is z < 4 ? (1) z < 9 (2) t < -4 [#permalink] New post 04 May 2012, 23:44
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

66% (02:02) correct 34% (00:58) wrong based on 105 sessions
If zt < -3, is z < 4 ?

(1) z < 9
(2) t < -4
[Reveal] Spoiler: OA
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 25238
Followers: 3429

Kudos [?]: 25228 [0], given: 2702

Re: If zt < -3, is z < 4 ? (1) z < 9 (2) t < -4 [#permalink] New post 04 May 2012, 23:52
Expert's post
naveenhv wrote:
If zt < -3, is z < 4 ?

(1) z < 9
(2) t < -4


Number picking would probably be the most efficient way to attack this problem. Even when we consider both statements together we can easily find two sets of numbers which give us different answers to the question whether z<4:

If z=5 and t=-5 (zt=-25<-3) the answer is NO;
If z=1 and t=-5 (zt=-5<-3) the answer is YES.

Answer: E.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

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?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Manager
Manager
User avatar
Joined: 28 Jul 2011
Posts: 213
Followers: 0

Kudos [?]: 27 [0], given: 13

Re: If zt < -3, is z < 4 ? (1) z < 9 (2) t < -4 [#permalink] New post 06 May 2012, 14:30
Vote for E

i did it this way


(A) when Z < 9

if (Z = 8 and t = -1/2)

zt < -3 = true

Z < 4 (NO)


if (Z = 2 and t = -1/2)

zt < -3 = true

Z < 4 (Yes)

Data not sufficient

----------------------------

(B) t < -4

if (Z = 8 and t = -5)

zt < -3 = true

Z < 4 (NO)


if (Z = 2 and t = -5)

zt < -3 = true

Z < 4 (Yes)

Data not sufficient

-----------------------------

(C) combine when Z < 9 and t < -4

if (Z = 8 and t = -5)

zt < -3 = true

Z < 4 (NO)


if (Z = 2 and t = -5)

zt < -3 = true

Z < 4 (Yes)

Data not sufficient

there for E
Manager
Manager
avatar
Joined: 29 Oct 2013
Posts: 173
Concentration: Finance
GMAT 1: 750 Q48 V46
GMAT 2: Q V0
GRE 1: 327 Q161 V166
GPA: 3.7
WE: Corporate Finance (Retail Banking)
Followers: 3

Kudos [?]: 107 [0], given: 115

GMAT ToolKit User
If zt < -3, is z < 4 ? (1) z < 9 (2) t < -4 [#permalink] New post 20 Jun 2014, 23:18
Bunuel wrote:
naveenhv wrote:
If zt < -3, is z < 4 ?

(1) z < 9
(2) t < -4


Number picking would probably be the most efficient way to attack this problem. Even when we consider both statements together we can easily find two sets of numbers which give us different answers to the question whether z<4:

If z=5 and t=-5 (zt=-25<-3) the answer is NO;
If z=1 and t=-5 (zt=-5<-3) the answer is YES.

Answer: E.


Hi Bunuel and other experts,

When you do this(number picking) it seems so simply! However, number picking is my Achilles' Heel. It is just so frustratingly difficult for me to come up with right numbers.

When I micro-analyze my thinking process while I try to come up with right values to show counter examples this is what I see: I first need to ensure z <9 and then make sure that t < -4 and then ensure that zt< -3 with the aim of getting a NO for z<4. Even though I am using 'then' after every decision, the fact is- to generate right values, you essentially need to make these 4 decisions simultaneously. I simply dont know how I can do this in 20-30 seconds without befuddling my short term memory apparatus. I am saying 20-30 secs as in most of the hard questions you will have to rule out st-A, st-B and A+B. thus you will make 5-6 such decisions for every question.

When I solve such questions I am either totally flustered or take more than 4 mins. Are there efficient ways to do this and which will work for most of the hard problems (inequality, modulus, reciprocal, neg/pos and their combination) etc..in less than 2-3 mins?
Thanks!
_________________

Please consider giving 'kudos' if you like my post and want to thank :)

Read about my journey to 750 here - a-non-native-speakers-journey-to-99-le-on-verbal-750overall-171722.html#p1367876

If zt < -3, is z < 4 ? (1) z < 9 (2) t < -4   [#permalink] 20 Jun 2014, 23:18
    Similar topics Author Replies Last post
Similar
Topics:
2 if zt<-3, is z<4? 1) z<9 2) t<-4 OA = E sandranjeim 7 16 Apr 2010, 09:00
If zt < -3, is z < 4? a. z < 9 b. t < -4 OA : E msand 1 08 Apr 2010, 12:30
If Z*T is < -3, is Z < 4 1 Z < 9 2 T < -4 kizito2001 9 28 Feb 2008, 16:32
Is z+z<z? 1) -4z>4z 2) z^3<z^2 netcaesar 5 18 Oct 2006, 12:26
If zt < -3, is z < 4? (1) z < 9 (2) t < -4 rigger 5 24 Oct 2005, 21:31
Display posts from previous: Sort by

If zt < -3, is z < 4 ? (1) z < 9 (2) t < -4

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

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®.