Question
Fred folded 66 paper aeroplanes in three days. Each day after the first day, he folded 6 more paper aeroplanes than the day before. How many paper aeroplanes did he fold on the first day?
3 m

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Fred folded 66 paper aeroplanes in three days. Each day after the first day, he folded 6 more paper aeroplanes than the day before. How many paper aeroplanes did he fold on the first day?