Make word problems sometimes defy logic to get 2 a good answer?

I watch a show called "The mathematics in demand, "where a viewer asked about a problem involving buy CDs (or a music CD" as the lady said in the program.) Apparently, the answer was a CD costs $ 6, which seems absurd. (I'db Lucky 2 buy a CD that costs 2x that at Wal-Mart.) & Reminded me of Dave Barry discuss the problem of two trains, u'no, where one driver south of Miami and another trip to the west of San Diego. Problems found in the text or logic contempt for solution 2? Teachers make this notice or in textbooks such as McGraw Hill, HBJ, Southwest or any other publication? And if a student observes logic problems of the poor, teachers will be prepared 2 shares w / the class about the falsity or observed only to insist, perhaps dogmatic, 2 solve the problem? I do not think about that. I think the reality is a better word to use logic, which is what I meant 2. Thanks guys. Keep 'em coming!

Secundo the reply before mine. Defying logic is very different to challenge the world we know. Your examples really stretching, not logic. An example of defying the logic would be something like this: Somebody said, "If it rains, Jack uses an umbrella." So when the rains, and Jack does not use an umbrella, which defies the logic of this person.

Lecture – 10 Inference in First Order Logic