Number Riddle Games: Find the Value of the Missing Number

Seeing at the boxes you can find the connection between the numbers.

The addition of letters in black is equal to the result of the multiplication of the numbers in green and red.

for example in the first box;

2 + 1 + 6 = 9  = 9 x 1

Similarly we can check the other boxes;

3 + 6 + 5 = 14 = 7 x 2 &

5 + 4 + 1 = 10 = 5 x 2.

Therefore we can find the missing number as;

6 + 5 + 4 = 15 = 3 x ?

Therefore;

? = 15/3 = 5

Answer = 5