Mom gave Xiaolan 80 yuan. Xiaolan spent 56 yuan on books, and the remaining money just bought 3 pens. How much is each pen?
妈妈给了小兰80元钱．小兰买书花了56元，剩下的钱正好买了3支钢笔．每支钢笔多少钱？
<gadget id="calculator">80 - 56</gadget>
<output>24</output>

<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<result>8</result>