Your question is Brain Teaser on Conditional Probability. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Solve a brain teaser involving conditional probability or expected values.
The prompt does not specify the events, probabilities, payoffs, or decision rule needed to produce a unique numerical answer. In an interview, state the missing information clearly, ask a focused clarification question, and then describe the calculation you would perform once the teaser is specified.