Question
Peter folded 30 paper cranes on the first day. Each day he did 6 more paper cranes than the previous day. On the last day, he made 90 cranes. How many days did he fold paper cranes?
2 m

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Peter folded 30 paper cranes on the first day. Each day he did 6 more paper cranes than the previous day. On the last day, he made 90 cranes. How many days did he fold paper cranes?