4, 6, 8, 9, 10.
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Composite numbers less than 20 are 4, 6, 8, 9, 10, 12, 14, 15, 16 and 18.
They are 4 6 8 9 and 10
You may mean: 3 and 5 are prime numbers that add up to the composite number of 8
12 is even, that is 2 divides 12 so 12 cannot be prime.12 is composite. (all even numbers greater than 2 are composite)
4, 6, 8, 9, 10, 12, 14, 15