Question
Carl folded 70 paper cranes in five days. Each day after the first day, he folded 5 more paper cranes than the day before. How many paper cranes did he fold on the first day?
3 m

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Carl folded 70 paper cranes in five days. Each day after the first day, he folded 5 more paper cranes than the day before. How many paper cranes did he fold on the first day?