Question
Ian folded 72 paper cranes in four days. Each day after the first day, he folded 4 less paper cranes than the day before. How many paper cranes did he fold on the first day?
3 m

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Ian folded 72 paper cranes in four days. Each day after the first day, he folded 4 less paper cranes than the day before. How many paper cranes did he fold on the first day?