SOLUTION: A framer noticed that he had placed 15 pigs into four pens in such a way that each pen surrounded an odd number of pigs. How was this done?

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Question 254795: A framer noticed that he had placed 15 pigs into four pens in such a way that each pen surrounded an odd number of pigs. How was this done?
Answer by drk(1908) About Me  (Show Source):
You can put this solution on YOUR website!
15 = 8 + 7. 7 is odd
Now, 8 = 5 + 3
So,
15 = 7 + 5 + 3