Galaxy Supermarket shipped 10 packs of towels, 240 per pack. 1420 sold, how many left?
银河超市运来10包毛巾，每包240条．卖出1420条，还剩多少条？
<gadget id="calculator">240 * 10</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 - 1_420</gadget>
<output>980</output>

<result>980</result>