Hello, my task is this:

The asociation of two disjoint events A and B is the certain event. From the event X and the Events A and B are known, the conditional probabilities:
P(X|A)=1/4 P(X|B)=1/3 P(A|X)=1/2

P(A)=? P(B)=?

Hey, Im working on that for a long time, a lot of googleing didnt help me out.
Can anyone help me solve this please.