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3

Part of 2014 Paraguay Mathematical Olympiad

Problems(1)

2014 Paraguayan Mathematical Olympiad: Problem 3

Source:

8/13/2015
Juan chooses a five-digit positive integer. Maria erases the ones digit and gets a four-digit number. The sum of this four-digit number and the original five-digit number is 52,71352,713. What can the sum of the five digits of the original number be?
algebra