Question
Rael folded 19 paper aeroplanes on the first day. Each day he did 2 more paper aeroplanes than the previous day. On the last day, he made 39 aeroplanes. How many days did he fold paper aeroplanes?
2 m

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Rael folded 19 paper aeroplanes on the first day. Each day he did 2 more paper aeroplanes than the previous day. On the last day, he made 39 aeroplanes. How many days did he fold paper aeroplanes?