First, the three numbers must be added:
20 + 22 + 23 = 65
Then the sum must be divided by three, because that is how many numbers there are:
65 / 3 = 21 1/3
The average of 20, 22, and 23 is 21 1/3.
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21.8Simply add them all up, and then divide by how many numbers you have.
21+1=22 23-1=22 11x2=22 20+2=22 24-2=22, etc.
All the numbers are composite except the ones in bold: 18 19 20 21 22 23 24 25.
20 + 3 = 23 23 + 5 = 28 28 / 2 = 14 14 + 3 = 17 17 + 5 = 22 22 / 2 = 11 11 + 3 = 14 14 + 5 = 19 19 / 2 = 9.5
The difference between 72 and 16