If you're going to ask the question, you ought to know the answer

Not in general, of course, but if you are quizzing your older sister on math problems, you might want to stick to questions you know the answer to.

Skibo this evening asked Boo "what is eight hundred plus ninety hundred?"
But whatever she answered, I don't think he'd have known whether it was right or not!

Yours, amused by this, of course,
N.