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: the product of a and b is equal to 12 more than twice the sum of a and b . if b = 10 , what is the value of b - a ? 
Options: a ) 2 , b ) 5 , c ) 7 , d ) 6 , e ) 35
[A]: d


[Q]: Problem: how many numbers from 10 to 1000 are exactly divisible by 9 ? 
Options: a ) 100 , b ) 10 , c ) 11 , d ) 12 , e ) 14
[A]: a


[Q]: Problem: what is the greatest positive integer x such that 3 ^ x is a factor of 9 ^ 5 ? 
Options: a ) 5 , b ) 9 , c ) 10 , d ) 20 , e ) 30
[A]:
c