Task: Question Answering
Input (English): Problem: 5 is added to a certain number , the sum is multiplied by 5 , the product is divided by 5 and 5 is subtracted from the quotient . the remainder left is half of 60 . what is the number ? 
Options: a ) 21 , b ) 20 , c ) 2 , d ) 30 , e ) 45
Output (English): c