Task: Question Answering
Input (English): Problem: the ratio of a to b to c is 2 to 3 to 4 , and a , b , c are positive integers . if the average ( arithmetic mean ) of the 3 numbers is 42 , what is the value of a ? 
Options: a ) 24 , b ) 25 , c ) 28 , d ) 30 , e ) 32
Output (English): c