Task: Question Answering
Input (English): Problem: right now , the ratio between the ages of sandy and molly is 4 : 3 . after 6 years , sandy ’ s age will be 34 years . what is molly ' s age right now ? 
Options: a ) 12 , b ) 15 , c ) 18 , d ) 21 , e ) 24
Output (English): d