Mr. Wang bought 3 boxes of pens, 10 in each box, and the total cost was 240 yuan. How much is each pen?
王老师买了3盒钢笔，每盒10支，一共用了240元，每支钢笔多少元？
<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<gadget id="calculator">240 / 30</gadget>
<output>8</output>

<result>8</result>