<h1>Puzzle 117-Free on line practice</h1>

Collection find the missing number

By Panos Kalliantasis

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Below you can see the answer and the solution.

There are two correct answers
1.
Correct answer is 53

6^2-4^2=36-16=20
5^2-3^2=25-9=16
So 20+16=36

7^2-4^2=49-16=33
6^2-4^2=36-16=20
So 33+20=53

2.
Correct answer is 42
 (A+B+C+D)*2
6+7+4+4=21
21*2=42