Paulo Cesar's asses
If we put 2 bags on each donkey, there are 13 bags left. That is, Being x the number of donkeys, the number of bags is 2x + 13.
If we put 3 bags on each donkey, there are 3 unoccupied donkeys. In this case, the number of bags would be 3x-9.
So just assemble the equation and find the number of donkeys, and then find the number of bags.
2x + 13 = 3x-9
13 + 9 = 3x-2x
x = 22 asses
If there are 22 asses, the number of bags is 2 (22) +13 = 57.
Answer: Paulo Cesar must carry 57 bags.
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