Answer:
A Number can by divided by 3 if the sum of its digest can be divided by 3.
27 | 2 + 7 = 9 --> can be divided by 3
45 | 4 + 5 = 9 --> can be divided by 3
60 | 6 + 0 = 6 --> can be divided by 3
75 | 7 + 5 = 12 --> can be divided by 3
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