Task: Question Answering
Input (English): Problem: among 7 numbers the average of first 4 numbers is 13 and the average of last 4 numbers is 15 . the sum of last 3 numbers is 55 . the square of the fourth number is equal to the last number then what is the last number ? 
Options: a ) 60 , b ) 52 , c ) 5 , d ) 25 , e ) 125
Output (English): d