Question
Oliver folded 15 paper guns on the first day. Each day he did 10 more paper guns than the previous day. On the last day, he made 165 guns. How many days did he fold paper guns?
2 m

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Oliver folded 15 paper guns on the first day. Each day he did 10 more paper guns than the previous day. On the last day, he made 165 guns. How many days did he fold paper guns?