Greek mathematician Diophantine interesting topic: now there are four numbers, take every three of them to add, then the sum is 22, 24, 27 and 20 respectively, find out how many of these four numbers are______ ．

Greek mathematician Diophantine interesting topic: now there are four numbers, take every three of them to add, then the sum is 22, 24, 27 and 20 respectively, find out how many of these four numbers are______ ．

Let the sum of the four numbers be x, then 22 + 24 + 27 + 20 = 3x, x = 31, the four numbers are 31-22 = 9, 31-24 = 7, 31-27 = 4, 31-20 = 11

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