Math, Science and Logic PuzzLeS - for the "enginerd" in all of us
(re-printed with permission from Pzzls - www.pzzls.com)
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Address unknown
Mr. House would like to visit his old friend Mr. Street, who is living in the main street of a small village. The main
street has 50 houses divided into two blocks and numbered from 1 to 20 and 21 to 50. Mr. House has forgotten the
number, so he asks a passer-by, who replies "just try to guess it." Mr. House likes playing games and asks three
questions:
- In which block is it?
- Is the number even?
- Is it a square?
After Mr. House has received the answers, he says: "I'm still in doubt, but if you'll tell me whether the digit 4 is in the
number, I will know the answer!" Then Mr. House runs to the building in which he thinks his friend is living. He rings,
a man opens the door and it turns out that he's wrong. The man starts laughing and tells Mr. House: "Your advisor is
the biggest liar of the whole village. He never speaks the truth!" Mr. House thinks for a moment and says "Thanks,
now I know the real address of Mr. Street."
What is the address of Mr. Street?
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