Read into the complex nature of the events and learn how it could be manipulated with different variables; more importantly, try to lay it down in a simpler form. To what I see there can be more than one way for this:
Option 1: When you know the answer; Clear goal.
Solution: Find the way to form the correct question; it’s essential to create the right question to get the expected answer. No other way; discard the variables which could manipulate the situation.
Option 2: When you have multiple choice, and there are more than one correct answers; This is because the problem is allowed to be manipulated with various variables. And since we are not referring to the mathematical problem; it is obvious someone, or something has to give.
Solution: Form the correct question to suit the answer.
Either of the cases may not have the easy way to solve the problem; someone or something will have to give in real life.
Trying to relate the Problem solving and critical thinking strategy to real life from mathematical learnings.