Xiaoxiao went to the stationery store and bought 5 pens, paid 50 yuan, and got 5 yuan back. How much is each pen?
笑笑去文化用品店买了5枝钢笔，付出50元，找回5元．每枝钢笔多少元？
<gadget id="calculator">50 - 5</gadget>
<output>45</output>

<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<result>9</result>