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# ds - hard

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Joined: 22 Nov 2007
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ds - hard [#permalink]  10 Dec 2007, 05:21
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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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Joined: 13 Jun 2007
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A

assume the integer n=abc where a is the hundreds, b is the tens, c is first digit. We are trying to find b
(i) 10n=abc0 so b=6 as the information tells us

(ii) if n+1 then b=7. But this depends on if c=9 or not.
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