There are 385 packs of chocolates in the store, some are sold and 260 packs are shipped in, and now there are 392 packs of chocolates. How many packs were sold?
商店里有385包巧克力，卖出一些后又运进260包，现在有巧克力392包．卖出了多少包？
<gadget id="calculator">260 - 392</gadget>
<output>-132</output>

<gadget id="calculator">385 + (-132)</gadget>
<output>253</output>

<result>253</result>