Aunt Liu made a batch of craft shoes. On the first day, she made 8 pairs. On the second day, she became more and more skilled. Every day she made 2 pairs more than the previous day. On the last day, she made 24 pairs. How many days did she do it? How many
刘大妈做一批工艺鞋，第一天做了8双，第二天起手艺越来越熟练，每天都比前一天多做2双，最后一天做了24双．她一共做了几天？多少
<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>