They are: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30.
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There are 15 composite numbers greater than 50 but less than 70
All of them except for 31, 37, 41, 43 and 47 which are prime numbers.
20, 22, 24, 25, 26, 28, and 30
Even composite numbers can, odd composite numbers can't.
To any set that contains it! It belongs to {30}, or {45, sqrt(2), 30, pi, -3/7}, or all whole numbers between 23 and 53, or multiples of 5, or square roots of 900, or composite numbers, or counting numbers, or integers, or rational numbers, or real numbers, or complex numbers, etc.