Question
Oliver folded 57 paper aeroplanes in three days. Each day after the first day, he folded 3 less paper aeroplanes than the day before. How many paper aeroplanes did he fold on the first day?
3 m

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Oliver folded 57 paper aeroplanes in three days. Each day after the first day, he folded 3 less paper aeroplanes than the day before. How many paper aeroplanes did he fold on the first day?