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

[EX Q]: Problem: on a certain road , 10 % of the motorists exceed the posted speed limit and receive speeding tickets , but 20 % of the motorists who exceed the posted speed limit do not receive speeding tickets . what percent of the motorists on that road exceed the posted speed limit ?
[EX A]: 12.5 %

[EX Q]: Problem: if s and t are both odd prime numbers ands < t , then how many different positive integer factors does 2 sthave ?
[EX A]: 8

[EX Q]: Problem: if integer k is equal to the sum of all even multiples of 15 between 390 and 615 , what is the greatest prime factor of k ?
[EX A]:
8