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 Q]: Problem: what is the next number 12 13 15 17 111 113 117 119 123 129 ? 
Options: a ) 154 , b ) 220 , c ) 129 , d ) 131 , e ) 224
[EX A]: d

[EX Q]: Problem: 2525 * 9 
Options: a ) 22725 , b ) 25675 , c ) 22655 , d ) 27575 , e ) none of these
[EX A]: a

[EX Q]: Problem: the ratio 6 : 5 expressed as a percent equals 
Options: a ) 12.5 % , b ) 40 % , c ) 120 % , d ) 125 % , e ) none
[EX A]:
c