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: roy is now 8 years older than julia and half of that amount older than kelly . if in 4 years , roy will be twice as old as julia , then in 4 years what would be roy ' s age multiplied by kelly ' s age ?
Options: a ) 172 , b ) 180 , c ) 192 , d ) 200 , e ) 216
[A]: c

[Q]: Problem: how many multiples of 2 are there between 10 and 52 , 10 and 52 inclusive ?
Options: a ) 27 , b ) 25 , c ) 24 , d ) 21 , e ) 22
[A]: e

[Q]: Problem: set a contains all the even numbers between 4 and 50 inclusive . set b contains all the even numbers between 104 and 150 inclusive . what is the difference between the sum of elements of set b and the sum of the elements of set a ?
Options: a ) 2400 , b ) 2550 , c ) 5050 , d ) 6275 , e ) 11325
[A]:
a