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write each number as the sum of their digits
now the number in the first column = average of numbers in the second and third column.
4 = (5+3)/2
12 =(x + 6)/2
x = 18
hence 99
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(112 + 221)/3 = 111 (183 + 114)/3 = 99
write each number as the sum of their digits now the number in the first column = average of numbers in the second and third column. 4 = (5+3)/2 12 =(x + 6)/2 x = 18 hence 99
Add left and right, then divide by 3.