Five pencil cases cost 50 yuan, and the teacher has 150 yuan. How many pencil cases can you buy?
5个铅笔盒50元，老师有150元，可以买几个这样的铅笔盒？
<gadget id="calculator">50 / 5</gadget>
<output>10</output>

<gadget id="calculator">150 / 10</gadget>
<output>15</output>

<result>15</result>