Task: Question Answering
Input (English): Problem: the number of stamps that p and q had were in the ratio of 7 : 2 respectively . after p gave q 15 stamps , the ratio of the number of p ' s stamps to the number of q ' s stamps was 2 : 1 . as a result of the gift , p had how many more stamps than q ? 
Options: a ) 25 , b ) 35 , c ) 45 , d ) 55 , e ) 65
Output (English): c