Each notebook is 25 yuan, and each pen is 5 yuan. After Xiaohua buys a notebook with 50 yuan, how many pens can he buy with the remaining money?
每本笔记本25元，每枝钢笔5元，小华用50元买了一本笔记本后，剩下的钱最多可以买多少枝钢笔？
<gadget id="calculator">50 - 25</gadget>
<output>25</output>

<gadget id="calculator">25 / 5</gadget>
<output>5</output>

<result>5</result>