Tough Logical Reasoning Question: Critical Thinking Puzzle

This is a tough logical reasoning question that will twist your brain. In this brain-twister logical question, you are shown some number equations. There is some hidden logical pattern in these number equations. Your task in this puzzle question is to crack the logical reasoning hidden in these number equations. Once you are able to crack the logical code, find the value of the missing number which will replace the question mark. Write your answer in the comments along with logical reasoning for this tough logical question.

Can you solve this tough logical question?

The answer to this "Tough Logical Question", can be viewed by clicking the answer button.

The answer is 27
If A+B = C is the given number equation then the logical reasoning hidden in these logical equations is as below
C=B*B-2xAxB.


There is another alternative logic to this puzzle question. This logic came up during the discussion of this puzzle in the Mensa Group.
The answer is 21.
The logical reasoning in this answer is as below
C= 10B-7A-(AxB)-21

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