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'.

Ex Input:
Problem: a number is doubled and 5 is added . if the resultant is trebled , it becomes 123 . what is that number ?
Options: a ) 12 , b ) 29 , c ) 27 , d ) 18 , e ) 99

Ex Output:
d

Ex Input:
Problem: there are two numbers . if 20 % of the first number is added to the second number , then the second number increases to its 5 - fourth . what is the ratio of the first number to the second number ?
Options: a ) 2 : 9 , b ) 3 : 8 , c ) 8 : 5 , d ) 5 : 4 , e ) 7 : 3

Ex Output:
d

Ex Input:
Problem: find the average of all the numbers between 6 and 34 which are divisible by 5 .
Options: a ) 18 , b ) 20 , c ) 24 , d ) 30 , e ) 32

Ex Output:
b