It is (677 + 878)/2 = 777.5
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(766+878)/2 = 1644/2 = 822822. Add the two numbers together and divide by 2.The average is: (766+878)/2 = 822
878 - 766 = 112 as there are 2 numbers divide by 2 112 / 2 = 56 766 + 56 = 822 = 878 + 56
677 is prime!
Simple! they are 1 and 677
677 + 677 = 1,354