The average of the three numbers is 8.9, of which the first number is 7.9, which is 0.6 less than the third number, then the second number is 7.9______ ．

8.9 × 3-7.9 - (7.9 + 0.6), = 26.7-7.9-8.5, = 10.3; answer: the second number is 10.3; so the answer is: 10.3

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