My stepson, who is in Grade 7, got the following question in his math 
homework: 
  
"Three circles are drawn on a flat surface. Each circle encloses an 
area of 20 cm^2. They overlap so that the total area that is enclosed 
by one or more circles is 36 cm^2. The area that is enclosed by all 
three circles is 3 cm^2. What is the total area that is enclosed by 
exactly two circles?" 
  
(I've probably changed the wording a bit, but the sense should be 
clear.) 
  
The more I play with it, the more interesting it gets. Any thoughts 
about it, from anyone, would be welcome. 
  
                             dow 
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