Teacher Wang and Teacher Li went to buy fountain pens together. Teacher Wang bought 15 pens, and Teacher Li bought 18 pens. The two spent a total of 297 yuan. How much is each pen?
王老师和李老师一起去买钢笔，王老师买了15支，李老师买了18支，两个人一共花了297元．每支钢笔多少元？
<gadget id="calculator">15 + 18</gadget>
<output>33</output>

<gadget id="calculator">297 / 33</gadget>
<output>9</output>

<result>9</result>