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They are: 2 3 5 7 11 13 17 19 and 23
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The first five prime numbers are 2, 3, 5, 7, and 11. I don't know what you mean by "of 28".
The numbers are 13 and 41. And you do not need to know that they are prime in order to find the answer. The sum (54) and difference (28) provide all the necessary information.
How many numbers are in 28