I want to addition One array key and value with another array values : Please help me. I have fallen a Problem.

I want to addition One array key and value with another array values. 

Here is my arrays: 

    Array ( [6] => 12 [8] => 9 [10] => 11 )

    Array ( [6] => 70 [8] => 10 [9] => 35 [10] => 25 [11] => 25 [12] => 2 )

Here Example (6 => 12 according to addition 70 + 2 )

my expected output should be:
 

    array ([0] => 72 [1] => 45 [2] => 50 )

Thanks In Advance
