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: find the average of first 4 multiples of 15 ? 
Options: a ) 10 , b ) 12.6 , c ) 22.5 , d ) 31.3 , e ) 37.5
[EX A]: e

[EX Q]: Problem: for how many integer values of n will the value of the expression 4 n + 7 be an integer greater than 1 and less than 100 ? 
Options: a ) 30 , b ) 28 , c ) 27 , d ) 25 , e ) 26
[EX A]: d

[EX Q]: Problem: how many numbers from 10 to 50 are exactly divisible by 3 . 
Options: a ) 13 , b ) 14 , c ) 16 , d ) 17 , e ) 19
[EX A]:
a