The school bought 6 boxes of badminton, 12 in each box, 32 were used up, how many are left?
学校买来6盒羽毛球，每盒12个，用去了32个，还剩多少个？
<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<gadget id="calculator">72 - 32</gadget>
<output>40</output>

<result>40</result>