The two numbers are 10 and 4
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2 x 7 = 14
x + y = 39 x - y = 11 _________ 2x = 50 x = 25 y = 14
No, they are not. You can add two composite numbers, 15 and 14 for example, and get a sum, 29, that is prime.
No.
It is the pair (5, 9).