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

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A and B are in a line to purchase tickets. How many people [#permalink] New post 29 Jan 2008, 11:44
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?
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Re: line [#permalink] New post 29 Jan 2008, 12:04
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

The answer is (C)
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Re: line [#permalink] New post 29 Jan 2008, 12:09
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i agree with C.

the line consists of people behind A, A, people between A and B, B, and people in front of B.
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Re: line [#permalink] New post 29 Jan 2008, 12:15
Expert's post
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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Re: line [#permalink] New post 29 Jan 2008, 12:26
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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Re: line [#permalink] New post 30 Jan 2008, 00:06
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! :oops:
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Re: line [#permalink] New post 17 Mar 2008, 04:40
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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Re: line [#permalink] New post 17 Mar 2008, 13:03
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, 13:03
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