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Brain Teasers 3

 
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BigDaddy
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Joined: 25 Feb 2005
Posts: 148
Location: Orlando

PostPosted: Tue Oct 18, 2005 11:06 am    Post subject: Brain Teasers 3 Reply with quote

A brain teaser from the Hard category:

Mr. A lies on Mondays, Tuesdays, and Wednesdays; Mr. B lies on Thursdays, Fridays, and Saturdays. One day Mr A said "Yesterday was one of my lying days." Mr B said "Yesterday was one of my lying days too." What day of the week was it?

Any guesses?
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Father of 2 formerly homeschooled boys: Adam-15, Lucas-13
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bartii



Joined: 31 Mar 2005
Posts: 180
Location: Boise, ID

PostPosted: Sun Oct 23, 2005 9:16 am    Post subject: Reply with quote

It was Thursday. Mr. A doesn't lie on Thursday, but he had lied the previous day. Mr. B lies on Thursdays, thus he lied about lying on Wednesday.
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BigDaddy
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Joined: 25 Feb 2005
Posts: 148
Location: Orlando

PostPosted: Mon Oct 24, 2005 1:38 pm    Post subject: Reply with quote

Thursday is the correct answer.

The only days Mr A can say "I lied yesterday" are Mondays (lying) and Thursdays (truthfully). The only days Mr B can say "I lied yesterday" are Thursdays (lying) and Sundays (truthfully).
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