0
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6.456.45
It is: 64.5
It is: (63+57)/2 = 60
It is: 48
It is: 75
42
(17 + 63)/2 = 80/2 = 40
26.5
107
73
66
All are composite except 61 and 67. Composite numbers: 60, 62, 63, 64, 65, 66, 68, 69, 70