Question
Ivan folded 20 paper elephants on the first day. Each day he did 9 more paper elephants than the previous day. On the last day, he made 110 elephants. How many days did he fold paper elephants?
2 m

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Ivan folded 20 paper elephants on the first day. Each day he did 9 more paper elephants than the previous day. On the last day, he made 110 elephants. How many days did he fold paper elephants?