In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Example Input: Problem: if a person walks at 20 km / hr instead of 10 km / hr , he would have walked 20 km more . the actual distance traveled by him is : 
Options: a ) 20 km , b ) 56 km , c ) 60 km , d ) 70 km , e ) 80 km
Example Output: a

Example Input: Problem: each child has 5 crayons and 14 apples . if there are 10 children , how many crayons are there in total ? 
Options: a ) 22 , b ) 65 , c ) 12 , d ) 36 , e ) 50
Example Output: e

Example Input: Problem: the age of somu is one - third his father ' s . 9 years back he was one - fifth of his father ' s age . what is his persent age ? 
Options: a ) 11 , b ) 18 , c ) 14 , d ) 12 , e ) 10
Example Output:
b