Question
Vincent folded 18 paper boxes on the first day. Each day he did 9 more paper boxes than the previous day. On the last day, he made 135 boxes. How many days did he fold paper boxes?
2 m

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Vincent folded 18 paper boxes on the first day. Each day he did 9 more paper boxes than the previous day. On the last day, he made 135 boxes. How many days did he fold paper boxes?