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Tom and Jack are in a line to purchase iphones. How many

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Manager
Manager
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Status: Single
Joined: 05 Jun 2011
Posts: 130
Location: Shanghai China
Followers: 2

Kudos [?]: 12 [0], given: 0

Tom and Jack are in a line to purchase iphones. How many [#permalink] New post 09 Jul 2011, 02:43
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Difficulty:

  45% (medium)

Question Stats:

50% (01:36) correct 50% (00:17) wrong based on 10 sessions
Tom and Jack are in a line to purchase iphones. How many people are in the line?

(1) There are 20 people behind Tom and 20 people in front of Jack.

(2) There are 5 people between Tom and Jack.


My thought is since there are 20 people behind Tom and 20 people infront of Jack, so there are 19 people between Tom and Jack.

(2) I think it is correct. Because total people would be 7.
[Reveal] Spoiler: OA
Senior Manager
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Joined: 03 Mar 2010
Posts: 444
Schools: Simon '16 (M)
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Kudos [?]: 169 [0], given: 22

Re: Data sufficiency problem, pls help to explain [#permalink] New post 09 Jul 2011, 03:17
(1) There are 20 people behind Tom and 20 people in front of Jack.

20 T J 20
Total = 42

20 T 1 J 20
Total = 43
Two answer. Not sufficient.

2) There are 5 people between Tom and Jack.

T 5 J
Total = 7
20 T 5 J
Total = 27
Not sufficient.

Together, 20 T 5 J 20
Total = 47
14 J 5 T 14
Total = 35

Two answer. Not sufficient.

OA E
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Re: Data sufficiency problem, pls help to explain   [#permalink] 09 Jul 2011, 03:17
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Tom and Jack are in a line to purchase iphones. How many

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