(20+29+22+25)/4 = 24
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27
Nine: 18, 20, 21, 22, 24, 25, 26, 27, 28
All of them except 23 and 29 which are prime numbers
They are: 21 22 24 25 26 27 28 because 23 and 29 are prime numbers
10 ...They are:20, 21, 22, 23, 24, 25, 26, 27, 28, 29