An infinite amount of different numbers can be use to make the number 23
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To find the average of the numbers 12, 16, and 23, add them together: 12 + 16 + 23 = 51. Then, divide the sum by the number of values, which is 3: 51 ÷ 3 = 17. Therefore, the average of 12, 16, and 23 is 17.
25 = 23 + 2
The answer depends on where, within the sequence, the missing number should have been.
It is 15, the number halfway between the two middle numbers.
12