You have a set of 9 cards that are numbered from 1 to 9. Can you place the cards in 3 piles so that the sum of the numbers on the cards in each pile is the same?
Solution:
Yes. You can have 3 piles of 15: 1, 5, 9 and 2, 6, 7 and 3, 4, 8.
Are there other ways to get 3 piles of 15?
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