Question
Harry and Paul had 80 mini-helicopters. After Harry gave 10 mini-helicopters to Paul, Harry had thrice as many mini-helicopters as Paul. How many mini-helicopters did Harry have at first?
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Harry and Paul had 80 mini-helicopters. After Harry gave 10 mini-helicopters to Paul, Harry had thrice as many mini-helicopters as Paul. How many mini-helicopters did Harry have at first?