Question
Owen folded 30 paper guns on the first day. Each day he did 9 more paper guns than the previous day. On the last day, he made 120 guns. How many days did he fold paper guns?
2 m

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Owen folded 30 paper guns on the first day. Each day he did 9 more paper guns than the previous day. On the last day, he made 120 guns. How many days did he fold paper guns?