Teacher Zhang and 9 students go camping, and there is a tent for every 2 people, how many tents are needed in total.
张老师和9名学生去露营，每2人一顶帐篷，共需要多少顶帐篷．
<gadget id="calculator">1 + 9</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>