How to Solve Puzzle as given below

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Answer is 51
there are simple methods to slove this puzzle

Answer is 51 and here is my method:
First, 2nd and 3rd row elements are multiplied I.e. 7x4, 5x8, 6x9
Then we will subtract result of multiplication with the corresponding 1st row element i.e.
7x4 - 1 = 28 - 1 = 27
5x8 - 2 = 40 - 2 = 38
6x9 - 3 = 54 - 3 = 51 is the Answer.

47=28-1=27
5
8=40-2=38
69=54-3=51
So, answer is 6
9=54-3=51