Hedge Fund Trader Question:

The days of brain-teasers, designed to test candidates' mathematical reasoning skills, are slowly coming to an end in hedge funds. "It's been a while since clients have asked candidates how many glasses of water it takes to fill the Atlantic ocean," says Seath. "What they want to see is logical and punchy answers, often with a mathematical reasoning, throughout."

Essentially what this means is that if you linger too long on a point, or go off on a tangent that is likely to present a complex argument, the interviewer will pick up on this. Expect to be interrupted, have your thought processes questioned and argument torn apart. This, you've probably guessed, is less about the answer and more how you handle a stressful situation. The secret is to remain cool.