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: if a * b * c = ( √ ( a + 2 ) ( b + 3 ) ) / ( c + 1 ) , find the value of 6 * 15 * 2 . 
Options: a ) 8 , b ) 5 , c ) 11 , d ) 3 , e ) 4
[EX A]: e

[EX Q]: Problem: in a group of ducks and cows , the total number of legs are 22 more than twice the no . of heads . find the total no . of buffaloes . 
Options: a ) 11 , b ) 12 , c ) 13 , d ) 15 , e ) 16
[EX A]: a

[EX Q]: Problem: if x ^ 2 + 9 / x ^ 2 = 10 , what is the value of x - 3 / x 
Options: a ) 36 , b ) 25 , c ) 2 , d ) 5 , e ) 3
[EX A]:
c