Exams Are Approaching and Helen Is Allocating Time to Studying

Short Answer

Exams are approaching and Helen is allocating time to studying for exams. She thinks that with the appropriate amount of studying, she has a 70% chance of getting an A in Spanish, and a 20% chance of getting a B in Marketing. Assuming she has no obstacles limiting her available time to allocate to each subject, what is the probability that Helen gets an A in Spanish or a B in Marketing?