Call the four numbers A, B, C, D. "three of four numbers have a sum of 22" so that means A+B+C =22 "the average of the four numbers is 8" so that means (A+B+C+D) / 4 = 8 Now plug in what you know from the first equation into the second. (22 +D)...

Call the four numbers A, B, C, D. "three of four numbers have a sum of 22" so that means A+B+C =22 "the average of the four numbers is 8" so that means (A+B+C+D) / 4 = 8 Now plug in what you know from the first equation into the second. (22 +D)...

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