Question
Mark folded 58 paper cranes in four days. Each day after the first day, he folded 5 less paper cranes than the day before. How many paper cranes did he fold on the first day?
3 m

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Mark folded 58 paper cranes in four days. Each day after the first day, he folded 5 less paper cranes than the day before. How many paper cranes did he fold on the first day?