Task: Question Answering
Input (English): Problem: the average of 1 st 3 of 4 numbers is 16 and of the last 3 are 15 . if the sum of the first and the last number is 19 . what is the last numbers ? 
Options: a ) 2 , b ) 4 , c ) 6 , d ) 8 , e ) 7
Output (English): d