A furniture factory needs to make 1,860 sets of furniture. It has been done for 15 days, and 12 sets are made every day. How many sets are left?
一个家具厂要做1860套家具，已经做了15天，每天做12套，还剩几套没做？
<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<gadget id="calculator">1_860 - 180</gadget>
<output>1_680</output>

<result>1_680</result>