The students cleaned up, and 5 students wiped 20 pieces of glass. There are 36 pieces of glass in the classroom. How many students are needed?
同学们大扫除，5名同学擦20块玻璃．教室共有36块玻璃，一共需要几名同学？
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<result>9</result>