A food factory plans to produce 1600 boxes of moon cakes, and has been producing 40 boxes per day for 16 days. How many days are left to produce?
某食品厂计划生产1600盒月饼，已经生产了16天，每天生产40盒．剩下的还要生产多少天？
<gadget id="calculator">16 * 40</gadget>
<output>640</output>

<gadget id="calculator">1_600 - 640</gadget>
<output>960</output>

<gadget id="calculator">960 / 40</gadget>
<output>24</output>

<result>24</result>