Question
Jack folded 15 paper cranes on the first day. Each day he did 10 more paper cranes than the previous day. On the last day, he made 135 cranes. How many days did he fold paper cranes?
2 m

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Jack folded 15 paper cranes on the first day. Each day he did 10 more paper cranes than the previous day. On the last day, he made 135 cranes. How many days did he fold paper cranes?