How add 2 arrays?

[nilamo]

For example:
Henry scored 20 goals ; Owen scored 16  goals and Drogba scored 12 goals. Then make the same thing with the variable goal2


I will wish to get this as fin result
 
Henry will have 10 points  (6 + 4)
Owen will have 10 points   (4 + 6)
Drogba will have 4 points  (2+2)

We can't really talk about code until the input/output makes sense. And those numbers don't make sense.

If you score 20 goals, how do you have only 10 points? Where are 6 and 4 coming from? Is a goal only worth partial points?