Question
Zeph folded 60 paper planes in four days. Each day after the first day, he folded 6 more paper planes than the day before. How many paper planes did he fold on the first day?
3 m

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Zeph folded 60 paper planes in four days. Each day after the first day, he folded 6 more paper planes than the day before. How many paper planes did he fold on the first day?