1,000? 10,000? 100,000? Seriously?

Well, seriously, you might get asked brainteaser questions like these, especially in quantitative jobs. But remember that the interviewer doesn't necessarily want an exact number-he wants to make sure that you understand what's being asked of you, and that you can set into motion a systematic and logical way to respond. So, just take a deep breath, and start thinking through the math. (Yes, it's OK to ask for a pen and paper!)