Hi I am quite bad at IB Maths Probablitiy, if you guys could help that would be much appreciated.

Events A and B are such that P(A) = 0.3, P(B) = 0.6 and P(A∪B) = 0.7

The values q, r, s and t represent probabilities.

(a) Write down the value of t.

(b) Show that r = 0.2.

(c) Write down the value of q and of s.

(d) Write down P(B').

(e) Find P(A|B')

Cheers!