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: ifaequals the sum of the even integers from 2 to 20 , inclusive , andbequals the sum of the odd integers from 1 to 19 , inclusive , what is the value of b - a ? 
Options: a ) - 10 , b ) 10 , c ) - 19 , d ) 20 , e ) 21
[EX A]: a

[EX Q]: Problem: an object thrown directly upward is at a height of h feet after t seconds , where h = - 12 ( t - 3 ) ^ 2 + 120 . at what height , in feet , is the object 2 seconds after it reaches its maximum height ? 
Options: a ) 48 , b ) 54 , c ) 60 , d ) 66 , e ) 72
[EX A]: e

[EX Q]: Problem: a man is 28 years older than his son . in four years , his age will be twice the age of his son . the present age of this son is 
Options: a ) 21 years , b ) 22 years , c ) 23 years , d ) 24 years , e ) 25 years
[EX A]:
d