Task: Question Answering
Input (English): Problem: the ratio of the present age of sandy to that of molly is 7 : 2 . twelve years from now , the ratio of the ages of sandy to molly will be 5 : 2 . what was sandy ' s age 6 years ago ? 
Options: a ) 39 , b ) 45 , c ) 51 , d ) 57 , e ) 63
Output (English): d