This is typically a riddle (multiple potential answers but typically only 1 is accepted) dressed up to look like algebra...
Playing on the liklihood that you will notice the simple A+B+C pattern, the "equation" then seeks to isolate different types of perciever:
One group will percieve the sequence of equations to be part of the solution:
y={{a,b,c}={x}, {a,b,c}={x}, ...
Their solution is a=1; b=1; c=i; x=y[i][a]+y[i][b]+y[i][c]
Their answer is "69"
A second group will see the the sequence as two indexed columns in an array, delimited by the equals sign, and unrelated to each other:
The see y={{a,b}, {a,b}, ...}
Their answer is y[i][a]=[111+i] and y[i][b]=12+(i*11)
Their answer is "68"
A third group will see the the sequence as two un-indexed columns, delimited by the equals sign, and related to each other:
The see {a,b}, {a,b},
Their answer is b=((a-110)*11)+2
Their answer is 79
The final group doesn't respond to the sequence itself, just the individual equations:
They see {a,b,c}={x}, {a,b,c}={x}, ...
Their solution is (c*10)+a+b
Their answer is 79
The third and fourth group are generally treated as "correct" when the riddle is invoked.
To avoid the incorrect answers, the riddle could be written:
111=13, 113=35, 114=46, 115=57, 117=?
...eliminating the "112=24" segment breaks the array so it can no longer be valid against the first two examples. This would remove the obvious misdirection, and not isolate the different types of perciever.