Math Riddles

 
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Question: A grandfather has a broken grandfather clock that is off by a minute every hour (too fast). He figures out a way, while keeping it running at the same rate, to make the clock say the correct time twice a day.

How could he do this?

Answer: He made it run backwards.

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Question: Why are manholes round instead of square?

Answer: If they are round the manhole covers cannot slip into the hole if the hole is slightly smaller than the cover, but if they are square the hole would have to be about 50 percent of the area of the cover to stop the cover from falling into the hole (diagonally).

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Question: A mother is 21 years older than her child. In 6 years the mother will be 5 times older than her baby.

Where is the father?

Answer: He is with the mother.

If you do the math: (baby's age) + 21 + 6 = 5 * (baby's age + 6)
(baby's age) + 27 = 30 + 5 * (baby's age)
-3 = 4 * (baby's age)
-3/4 = baby's age
The baby will be born in 9 months.

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Question: A smart landscaper is given the task of placing 4 trees so that they are all the same distant away from each other.

How does he do this?

Answer: He puts three trees into a triangle then one on a hill in the middle (this forms a tetrahedron).

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Question: It takes ten men ten hours to build a certain wall. How long does it take five men to build the same wall?

Answer: No time, the wall is already built. There is no need to build it again.

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