Definition: In this task, you need to provide the correct option for a given problem from the provided options.
Input: Problem: at present the ratio between the ages of arun and deepak is 5 : 7 . after 6 years , arun ' s age will be 36 years . what is the age of deepak at present ?
Options: a ) 35 years , b ) 25 years , c ) 42 years , d ) 39 years , e ) 40 years
Output:
c