The lime yard needs to burn 324 tons of quicklime. It has been burned for 5 days, with an average of 57 tons per day. How many tons are left unfired?
石灰场要烧324吨生石灰，已经烧了5天，平均每天烧制57吨，还剩多少吨没有烧制？
<gadget id="calculator">5 * 57</gadget>
<output>285</output>

<gadget id="calculator">324 - 285</gadget>
<output>39</output>

<result>39</result>