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 man is 20 years older than his son . in two years , his age will be twice the age of his son . the present age of the son is ? 
Options: a ) 11 , b ) 25 , c ) 27 , d ) 18 , e ) 91
[A]: d


[Q]: Problem: when a number is divided by 6 & then multiply by 12 the answer is 8 what is the no . ? 
Options: a ) 4.5 , b ) 5 , c ) 5.5 , d ) 5.8 , e ) 4
[A]: e


[Q]: Problem: in a group of cows and hens , the number of legs are 20 more than twice the number of heads . the number of cows is : 
Options: a ) 5 , b ) 6 , c ) 7 , d ) 10 , e ) 12
[A]:
d