27 is the sum : 4 + 6+ 8 + 9 = 27
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Composite numbers greater than 20 and less than 30 are 21, 22, 24, 25, 26, 27, 28.
This question is impossible to answer because there are six composite numbers in that range, not five!
All of them except 31 and 37 which are prime numbers
All of the composite numbers less than 100 have factor pairs.
49, 50, 51, 52, 54 and 55 are the composite numbers between 48 and 56.