Missing Number Quiz Puzzle Answer


In the "sum" below one of the digits is missing, marked by a question mark. Clearly this is not an addition, subtraction or any normal sum. So what is going on?

57944

81039

87025

-------

75?36

What digit has been replaced by the question mark?

In the "sum" each digit below the line is the average of the three digits above it above the line. 9 plus 0 plus 0 equals 9, giving an average of 3.

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