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How many people are standing in line?

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Intern
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Joined: 01 Sep 2010
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How many people are standing in line? [#permalink] New post 04 Oct 2010, 05:12
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

53% (01:20) correct 46% (00:25) wrong based on 30 sessions
How many people are standing in line?

(1) Three people are standing in front of Alan and three people are standing behind David.

(2) Two people are standing between Alan and David.
[Reveal] Spoiler: OA
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How many people are standing in line? [#permalink] New post 04 Oct 2010, 05:21
Expert's post
eladshush wrote:
Hi all,

Please consider the following DS problem that I have been struggling with:

How many people are standing in line?

1. Three people are standing in front of Alan and three people are standing behind David.

2. Two people are standing between Alan and David.


Obviously each statement alone is not sufficient. When taken together we can have following two cases:

1. XXXDXXAXXX --> so in this case there are 10 people in the line;
2. AXXD --> so in this case there are 4 people in the line.

Two different answers, hence not sufficient.

Answer: E.

Hope it helps.
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Re: How many people are standing in line? [#permalink] New post 04 Oct 2010, 05:24
Wow Bunuel - that was fast.

I didn't consider the possible options for overlaps between David and Alan.

Thank you.
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Re: How many people are standing in line? [#permalink] New post 16 Oct 2010, 06:22
Tricky...i missed one situation...:(
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Algebra Length Of Line [#permalink] New post 23 Jun 2014, 02:34
Chandra and Ken are waiting in line for concert ticket s. If each person takes up 2 feet of space in the line,
how long is the line?
1) There are three people in front of Chandra and three people behind Ken
2) Two people are standing between Chandra and Ken
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Re: How many people are standing in line? [#permalink] New post 23 Jun 2014, 02:40
parassagi wrote:
Chandra and Ken are waiting in line for concert ticket s. If each person takes up 2 feet of space in the line,
how long is the line?
1) There are three people in front of Chandra and three people behind Ken
2) Two people are standing between Chandra and Ken



thats easy,

you dont know if Chandra stands infront of Ken or behind him.
Using the tewo scenarios, you will get 2 different ans, even if you combine the 2 choices.

Hence E
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How many people are standing in line? [#permalink] New post 23 Jun 2014, 02:41
Expert's post
parassagi wrote:
Chandra and Ken are waiting in line for concert ticket s. If each person takes up 2 feet of space in the line,
how long is the line?
1) There are three people in front of Chandra and three people behind Ken
2) Two people are standing between Chandra and Ken


Merging similar topics. Please refer to the solutions above.

Similar question to practice: pam-and-ed-are-in-a-line-to-purchase-tickets-how-many-98651.html

Hope it helps.

P.S. Please read and follow: rules-for-posting-please-read-this-before-posting-133935.html Pay attention to rule 3. Thank you.
_________________

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.


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How many people are standing in line?   [#permalink] 23 Jun 2014, 02:41
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