Problem: Given the question: W: Forty, but only twenty-five of them have got the books. What was said before this conversation?
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The answer is:
M: How many students are there in your class?

Problem: Given the question: W: Sure. I started exercising regularly two years ago and went from 253 pounds to a healthy 160 pounds and that is the only thing I did not give up halfway. What was said before this conversation?
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The answer is:
M: You look quite different from what you used to.

Problem: Given the question: M: Well, see as much as you can, because it's a country with a very different culture from ours. What was said before this conversation?
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The answer is:
W: I'm going to India next month. Is there any advice you'd like to give me on my first trip?