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'.

[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
[A]: b


[Q]: Problem: which number can we add to 897326 to get a number exactly divisible by 456 ? 
Options: a ) 58 , b ) 66 , c ) 74 , d ) 82 , e ) 90
[A]: d


[Q]: Problem: 75 % of 480 = ( ? ) x 15 ? 
Options: a ) 32 , b ) 18 , c ) 360 , d ) none of these , e ) can not be determined
[A]:
d