Task: Question Answering
Input (English): Problem: the ratio of ducks and frogs in a pond is 31 : 39 respectively . the average number of ducks and frogs in the pond is 152 . what is the number of frogs in the pond ? 
Options: a ) 148 , b ) 152 , c ) 156 , d ) 169 , e ) none
Output (English): d