The task is to generate the correct answer for a given math problem.

[EX Q]: Problem: the sum of all the digits of the integers from 18 to 21 inclusive is 24 ( 1 + 8 + 1 + 9 + 2 + 0 + 2 + 1 = 24 ) . what is the sum t of all the digits of the integers from 0 to 99 inclusive ?
[EX A]: 900

[EX Q]: Problem: a = 5 ^ 10 - 625 ^ 2 and a / x is an integer , where x is a positive integer greater than 1 , such that it does not have a factor p such that 1 < p < x , then how many different values for x are possible ?
[EX A]: two

[EX Q]: Problem: the length of a rectangle is increased by 40 % while its width is halved . what is the % change in area ?
[EX A]:
30 %', 'c ) 50 %', 'd ) 65 %', 'e ) 70 %'