878 - 766 = 112
as there are 2 numbers divide by 2
112 / 2 = 56
766 + 56 = 822 = 878 + 56
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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
It is (677 + 878)/2 = 777.5
It is (766 + 898)/2 = 832
766 + 876 = 1642 1642 / 2 = 821
767