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 tax on a commodity is diminished by 30 % but its consumption is increased by 15 % . find the decrease percent in the revenue derived from it ? 
Options: a ) 20 % , b ) 18 % , c ) 15 % , d ) 12 % , e ) 14 %
[EX A]: a

[EX Q]: Problem: if 2 ^ ( 2 w ) = 8 ^ ( w − 3 ) , what is the value of w ? 
Options: a ) 3 , b ) 6 , c ) 9 , d ) 12 , e ) 15
[EX A]: c

[EX Q]: Problem: what two - digit number is less than the sum of the square of its digits by 10 and exceeds their doubled product by 5 ? 
Options: a ) 94 , b ) 99 , c ) 26 , d ) 73 , e ) none of the above
[EX A]:
a