Question
Ivan folded 30 paper rabbits on the first day. Each day he did 10 more paper rabbits than the previous day. On the last day, he made 160 rabbits. How many days did he fold paper rabbits?
2 m

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Ivan folded 30 paper rabbits on the first day. Each day he did 10 more paper rabbits than the previous day. On the last day, he made 160 rabbits. How many days did he fold paper rabbits?