4 6 8 9 10 12 14 15 16 18 20 21 22 24 25 26 27 28 30 32 33 34 35 36 38 39 40 42 44 45 46 48 49 50
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1, 2, 5, 10, 25, 50
All even numbers are composite, because 2 is a factor of every even number.
All even numbers other than 2 are composite, so the even composite numbers between 30 and 50 are 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, and 50.
Apart from 2, all even numbers are composite. So the question is equivalent to all even numbers between 40 and 50. And these are ... ? 42, 44, 46 and 48.
50 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.