The supermarket shipped 50 cases of Coca-Cola, each with 12 bottles, and after selling 320 bottles, how many bottles are left?
超市运来50箱可口可乐，每箱12瓶，卖出320瓶后，还剩下多少瓶？
<gadget id="calculator">50 * 12</gadget>
<output>600</output>

<gadget id="calculator">600 - 320</gadget>
<output>280</output>

<result>280</result>