Puzzle on 2/26/02
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Students often ask me how old I am.
  
   
Last year my age was a
 prime number
   
This year my age is a
 multiple of 9

How old am I?

  
The solution
A prime number cannot be factored, except by 1 and itself. Some prime numbers are 2, 3, 5, 7
11, 13, 17, 19
23, 29
31, 37
41, 43, 47
53, 59
Here is a list of many prime numbers.
Multiples of 9 are the numbers you get
when you multiply by 9. 		Some multiples of 9 are 9, 18, 27, 36, 45, 54, 63.
Look for a prime number from the first list.
 
 
Look for the next consecutive number on the second list.

Choose a likely age for me from the second list.

I am 54.
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