Question
Ivan folded 63 paper aeroplanes in three days. Each day after the first day, he folded 5 more paper aeroplanes than the day before. How many paper aeroplanes did he fold on the first day?
3 m

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Ivan folded 63 paper aeroplanes in three days. Each day after the first day, he folded 5 more paper aeroplanes than the day before. How many paper aeroplanes did he fold on the first day?