The refrigerator factory needs to assemble 1,800 refrigerators. It took 6 days to assemble 220 refrigerators per day on average. How many more refrigerators will be assembled?
冰箱厂要装配1800台电冰箱，装配了6天，平均每天装配220台，还要装配多少台？
<gadget id="calculator">220 * 6</gadget>
<output>1_320</output>

<gadget id="calculator">1_800 - 1_320</gadget>
<output>480</output>

<result>480</result>