Task: Question Answering
Input (English): Problem: the number of stamps that p and q had were in the ratio of 7 : 3 respectively . after p gave q 13 stamps , the ratio of the number of p ' s stamps to the number of q ' s stamps was 5 : 4 . as a result of the gift , p had how many more stamps than q ? 
Options: a ) 10 , b ) 25 , c ) 40 , d ) 65 , e ) 90
Output (English): a