The teacher had given a long list of questions for Sammy to answer during his vacation. He calculated that if he answered the questions at the rate of 20 questions per hour, he will finish answering the questions one hour earlier than his usual time, and if he answered them at the rate of 16 questions per hour, it will take him one hour more than his usual time. How many questions did he have to answer?
1) 320 questions
2) 240 questions
3) 160 questions
4) 80 questions
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