Question
Archie and Ken had 78 mini-helicopters. After Archie gave 13 mini-helicopters to Ken, Archie had twice as many mini-helicopters as Ken. How many mini-helicopters did Archie have at first?
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Archie and Ken had 78 mini-helicopters. After Archie gave 13 mini-helicopters to Ken, Archie had twice as many mini-helicopters as Ken. How many mini-helicopters did Archie have at first?