I was wandering in an abandoned house. When I went down to the basement I found three doors. All three doors have a triangle painted on them, two of them with a number outside the triangle, these doors could open. Now I would like to open the third door to see what it conceals, therefore the missing number must be found.
The answer is most likely
If we look at the numbers in the 1st triangle
96 represents 9*6=54, 83 represents 8*3=24, 20 represents 2*0=0, 12 represents 1*2=2. Now, if we add these numbers together we get 54+24+0+2=80. The number outside the traingle are the average of the 4 numbers, which is 80/4=20.
The 2nd triangle
The same logic goes here. 117 represents 7, 93 represents 27, 21 represents 2. The total sum is 36. And this time we have 3 numbers inside the triangle so the average is 36/3=12.
Lastly the 3rd triangle(equivalent to 2nd triangle)
218 represent 16, 53 represents 15 and 27 represents 14. So the average is therefore 45/3=15.