The store shipped in 36 boxes of instant noodles, each with 20 bags, and sold 129 bags. How many bags are left?
商店运进36箱方便面，每箱20袋，卖出129袋，还剩多少袋？
<gadget id="calculator">20 * 36</gadget>
<output>720</output>

<gadget id="calculator">720 - 192</gadget>
<output>528</output>

<result>528</result>