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 Tanya's puzzle (Posted on 2016-05-10)
On April 16, 2015, Tanya Khovanova wrote in her blog:

<begin>
Here is my new logic puzzle.
I thought of a positive integer that is below 100 and is divisible by 7. In addition to the public knowledge above, I privately tell the units digit of my number to Alice and the tens digit to Bob. Alice and Bob are very logical people, but their conversation might seem strange:

Alice: You do not know Tanya’s number.
Bob: I know Tanya’s number.

What is my number?
<end>

Comments: ( Back to comment list | You must be logged in to post comments.)
 re(4): could be | Comment 7 of 10 |

One possibility is that Bob is a Liar from the land of Liars and Knights, and it's impossible to answer Tanya's question.
 Posted by Charlie on 2016-05-11 07:32:24

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