Little Bear Store shipped in 3 boxes of instant noodles, each with 24 packs. After selling 19 packs, how many packs are left?
小熊商店运进3箱方便面，每箱24包．卖出19包后，还剩多少包？
<gadget id="calculator">3 * 24</gadget>
<output>72</output>

<gadget id="calculator">72 - 19</gadget>
<output>53</output>

<result>53</result>