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Let the middle number of the three be n. Then the three consecutive numbers are n-1, n, n+1.

Their sum is n-1 + n + n+1 = 3n

Their average is 3n / 3 = n

The difference between their sum and their average is 3n-n = 2n

2n = 156

=> n = 78.

Thus the three numbers are 77, 78, 79

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โˆ™ 2010-06-02 06:46:07
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Q: The sum of three consecutive numbers is 156 more than their average what are these numbers?
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