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: the number 0.8 is how much greater than 1 / 8 ? 
Options: a ) ½ , b ) 27 / 40 , c ) 1 / 50 , d ) 1 / 500 , e ) 2 / 500
[EX A]: b

[EX Q]: Problem: if z is not equal to zero , and z = 6 zs − 9 s 2 − − − − − − − − √ z = 6 zs − 9 s 2 , then z equals : 
Options: a ) s , b ) 3 s , c ) 4 s , d ) - 3 s , e ) - 4 s
[EX A]: b

[EX Q]: Problem: ( 128.5 x 25 ) + ( 13.8 x 50 ) = ? x 50 
Options: a ) 78.05 , b ) 556.02 , c ) 574.36 , d ) 585.64 , e ) 595.46
[EX A]:
a