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

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If n is a positive integer, what is the tens digit of n ? [#permalink] New post 26 Dec 2012, 04:51
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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.
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Re: If n is a positive integer, what is the tens digit of n ? [#permalink] New post 26 Dec 2012, 04:53
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If n is a positive integer, what is the tens digit of n ?

(1) The hundreds digit of 10n is 6. This implies that the tens digit of n is 6. Sufficient.

(2) The tens digit of n + 1 is 7. If n=70, then the tens digit of n is 7, but if n=69, then the tens digit of n is 6. Not sufficient.

Answer: A.
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Re: If n is a positive integer, what is the tens digit of n ? [#permalink] New post 13 Jan 2013, 23:45
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fozzzy wrote:
How do you solve this one?


(1) The hundreds digit of 10n is 6
SUFFICIENT: If Hundred's place of 10n = 6 then Ten's place of n must be 6
e.g. n=68 tens place 6,
10n=680, hundreds place is 6

(2) The tens digit of n+1 is 7
INSUFFICIENT: If n=69; n+1=70 OR If n=77; n+1=77; i.e. n can have both 6 or 7 as tens place.

Hence choice(A) is the answer.
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Re: If n is a positive integer, what is the tens digit of n ? [#permalink] New post 20 Aug 2013, 06:49
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Re: If n is a positive integer, what is the tens digit of n ? [#permalink] New post 18 May 2014, 10:11
let n = ABCD

tens digit = C

1. 10n = ABCD0
given, hundreds digit = 6 (or) C = 6 - sufficient

2. tens digit of n+1 = 7.

consider CD = 69 -> CD+1 = 70 -> C=6 (or)

consider CD = 71 ->CD+1 = 72 -> C = 7

2 cases possible - insuff.

Hence A
Re: If n is a positive integer, what is the tens digit of n ?   [#permalink] 18 May 2014, 10:11
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