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# A and B are in a line to purchase tickets. How many people

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VP
Joined: 22 Nov 2007
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A and B are in a line to purchase tickets. How many people [#permalink]

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29 Jan 2008, 12:44
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A and B are in a line to purchase tickets. How many people are in the line?

(1) There are 15 people behind A and 15 people in front of B.
(2) There are 5 people between A and B.

how to approach this kind of problems?
Senior Manager
Joined: 26 Jan 2008
Posts: 263
Followers: 4

Kudos [?]: 109 [0], given: 16

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29 Jan 2008, 13:04
marcodonzelli wrote:
A and B are in a line to purchase tickets. How many people are in the line?

(1) There are 15 people behind A and 15 people in front of B.
(2) There are 5 people between A and B.

how to approach this kind of problems?

(1) We can conclude that the line looks like:
[15 people] A..........B [15 people], OR
......A [15 people] B........
Insufficient to calculate the total number of people in line (as we don't have any information on the dotted portion)

(2) The line looks like
.........A [5 people] B........
Insufficient

Combining (1) and (2), the line looks like:
[15 people] A [5 people] B [15 people]
or a total of 37

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Director
Joined: 01 Jan 2008
Posts: 624
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29 Jan 2008, 13:09
1
KUDOS
i agree with C.

the line consists of people behind A, A, people between A and B, B, and people in front of B.
CEO
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Posts: 3586
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
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Kudos [?]: 3968 [0], given: 360

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29 Jan 2008, 13:15
E

<----15-----A--5--B-----15------> N=15+1+5+1+15=37

<---9---B--5--A---9---> N=9+1+5+1+9=25
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Senior Manager
Joined: 26 Jan 2008
Posts: 263
Followers: 4

Kudos [?]: 109 [0], given: 16

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29 Jan 2008, 13:26
walker wrote:
E

<----15-----A--5--B-----15------> N=15+1+5+1+15=37

<---9---B--5--A---9---> N=9+1+5+1+9=25

nice catch walker. missed the second scenario. the answer would be E.
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30 Jan 2008, 01:06
walker wrote:
E

<----15-----A--5--B-----15------> N=15+1+5+1+15=37

<---9---B--5--A---9---> N=9+1+5+1+9=25

Let see you solve it. My mind is easily decieved!
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17 Mar 2008, 05:40
has to be E.

think of A as the pivot point to place B. B can be in fornt of or behind A. This changes the total number of people in the line since there must be exactly 15 people in front of B.
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CEO
Joined: 29 Mar 2007
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17 Mar 2008, 14:03
marcodonzelli wrote:
A and B are in a line to purchase tickets. How many people are in the line?

(1) There are 15 people behind A and 15 people in front of B.
(2) There are 5 people between A and B.

how to approach this kind of problems?

E.

2: tells us nothing
1: how many btwn them?

Heres the tricky part.

Could be AXXXXXB or BXXXXXA.

These scenarios produce different total numbers. No need to calculate the numbers.
Re: line   [#permalink] 17 Mar 2008, 14:03
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