If they have to be different, none (because 1 is not prime). If they can be similar, the only combination is 3 + 3 + 3.
You may mean: 3 and 5 are prime numbers that add up to the composite number of 8
19,29,59,79,89 are the prime numbers with 9 in its Unit place.
No even numbers add up to 9. The sum of even numbers is always an even number.
If the two numbers are relatively prime, their least common multiple is their product. The prime factors of 99 are 3, 3, and 11. Since the two numbers are relatively prime, the possibilities are 9 and 11 or 1 and 99. The pair of 9 and 11 add up to 20 and their least common multiple is 99. So, 9 and 11 are the two numbers.
If you mean 90 then they are 83+7 = 90
5 and 47, 9 and 43, 11 and 41, 23 and 29.
If they have to be different, none (because 1 is not prime). If they can be similar, the only combination is 3 + 3 + 3.
You may mean: 3 and 5 are prime numbers that add up to the composite number of 8
1, 3 and 9 are the factors of 9. 3 x 3 is the prime factorization of 9. 3 + 3 + 3 are three numbers that add up to 9.
19,29,59,79,89 are the prime numbers with 9 in its Unit place.
No even numbers add up to 9. The sum of even numbers is always an even number.
An odd number of odd numbers can not add up to an even number. There fore any 9 (odd) odd numbers can not add up to 50 (even).
9 9
If the two numbers are relatively prime, their least common multiple is their product. The prime factors of 99 are 3, 3, and 11. Since the two numbers are relatively prime, the possibilities are 9 and 11 or 1 and 99. The pair of 9 and 11 add up to 20 and their least common multiple is 99. So, 9 and 11 are the two numbers.
7,2
Any number can be made up from those numbers.