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: a is two years older than b who is twice as old as c . if the total of the ages of a , b and c be 12 , the how old is b ?
Options: a ) 10 years , b ) 4 years , c ) 6 years , d ) 15 years , e ) 16 years
[EX A]: b

[EX Q]: Problem: 25.25 / 2000 is equal to :
Options: a ) 1.012526 , b ) 0.012625 , c ) 0.12526 , d ) 0.12625 , e ) 0.12725
[EX A]: b

[EX Q]: Problem: calculate the value of n from the below equation : n ^ 3 a ' 10 n + 20 = 44
Options: a ) 1 , b ) 5 , c ) 3 , d ) 2 , e ) 4
[EX A]:
e