Detailed Instructions: In this task, you need to provide the correct option for a given problem from the provided options.
Problem:Problem: at present the ratio between the ages of arun and deepak is 4 : 3 . after 6 years , arun ' s age will be 26 years . what is the age of deepak at present ? 
Options: a ) 15 , b ) 21 , c ) 23 , d ) 12 , e ) 25
Solution:
a