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If n is a positive integer, what is the tens digit of n ?

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Manager
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If n is a positive integer, what is the tens digit of n ? [#permalink] New post 18 Dec 2004, 16:39
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  5% (low)

Question Stats:

66% (01:04) correct 33% (00:01) wrong based on 3 sessions
If n is a positive integer, what is the tens digit of n ?

(1) The hundreds digit of 10n is 6

(2) The tens digit of n+1 is 7
Manager
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Joined: 25 Aug 2004
Posts: 171
Location: MONTREAL
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Kudos [?]: 5 [0], given: 0

 [#permalink] New post 19 Dec 2004, 09:13
Looks like the Official Answer is A,

can someone explain the logic ?
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 [#permalink] New post 19 Dec 2004, 11:46
Quote:
Looks like the Official Answer is A,

can someone explain the logic ?


1) hundreth place of 10n is 6, so n is a number between 60 and 69 (inclusive).
so the tenth place of n is 6.

2) The tens digit of n+1 is 7 so N can be 69 to 78, so tenth place of n is either 6 or 7.

Hence A alone is sufficient.
  [#permalink] 19 Dec 2004, 11:46
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If n is a positive integer, what is the tens digit of n ?

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