Question
Asher folded 21 paper boats on the first day. Each day he did 9 more paper boats than the previous day. On the last day, he made 111 boats. How many days did he fold paper boats?
2 m

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Asher folded 21 paper boats on the first day. Each day he did 9 more paper boats than the previous day. On the last day, he made 111 boats. How many days did he fold paper boats?