You make a choice.

In the first example question, its a math choice. If the question is fuzzy but you can fix it, answer the fixed question.

In the 2nd example, make a choice of who among you will take the test, and answer for that one person.

But the main thing is, you must make one choice and stick with it. I would say that is the mindset i had to enter. Was i a scientist or a comedian?