Weekend cleaning. The whole class was divided into 3 groups, with 20 people in each group. Finally, the class leader counted and wiped 180 glasses in total. How much was wiped per person on average? (two ways to answer)
周末大扫除．全班同学分成了3个小组，每个小组20人，最后班长统计一下，一共擦了180玻璃，平均每人擦几块？(两种方法解答)
<gadget id="calculator">180 / 3 / 20</gadget>
<output>3</output>

<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<gadget id="calculator">180 / 60</gadget>
<output>3</output>

<result>3</result>