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

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Manager
Status: Single
Joined: 05 Jun 2011
Posts: 125
Location: Shanghai China
Followers: 2

Kudos [?]: 31 [0], given: 0

Tom and Jack are in a line to purchase iphones. How many [#permalink]

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09 Jul 2011, 03:43
00:00

Difficulty:

45% (medium)

Question Stats:

50% (01:56) correct 50% (00:20) wrong based on 12 sessions

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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
Joined: 03 Mar 2010
Posts: 440
Schools: Simon '16 (M)
Followers: 5

Kudos [?]: 252 [0], given: 22

Re: Data sufficiency problem, pls help to explain [#permalink]

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09 Jul 2011, 04:17
(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

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

OA E
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Re: Data sufficiency problem, pls help to explain   [#permalink] 09 Jul 2011, 04:17
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