Missing Number Mind Teaser with Answer and Explanation

This is a very interesting Mind teaser which will twist your brain. In this triangle math puzzle, you are shown some numbers inside and outside the triangle. Find the logical code which relates these numbers. So can you decode this logical pattern and find the number which will replace the question mark?

Can you find the missing number which replaces the question mark?

The answer to this "Missing Number Mind Teaser", can be viewed by clicking on the answer button.

The Answer is 17.
Multiple Upper and left side number and add the result to the right side number to get the number at the centre of the triangle.

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