The Prime number is 24
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All the numbers are composite except the ones in bold: 18 19 20 21 22 23 24 25.
The numbers are 18, 19, 20, 21 and 22.
First, the three numbers must be added:20 + 22 + 23 = 65Then the sum must be divided by three, because that is how many numbers there are:65 / 3 = 21 1/3The average of 20, 22, and 23 is 21 1/3.
The numbers are 18, 19, 20, 21 and 22.
20, 22, 24, 25, 26, 28, and 30