The school bought 3 boxes of chalk, 20 boxes each, and the total cost was 120 yuan. How much is an average box of chalk?
学校买来3箱粉笔，每箱20盒，一共用去120元．平均每盒粉笔多少钱？
<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<gadget id="calculator">120 / 60</gadget>
<output>2</output>

<result>2</result>