An electrical appliance factory originally planned to produce 6,300 refrigerators in 21 days. The task was completed within 18 days of actual production. How many more refrigerators are actually produced every day than the original plan?
一个电器厂原计划21天生产电冰箱6300台．实际生产18天就完成任务，实际每天比原计划每天多生产多少台冰箱？
<gadget id="calculator">6_300 / 18</gadget>
<output>350</output>

<gadget id="calculator">6_300 / 21</gadget>
<output>300</output>

<gadget id="calculator">350 - 300</gadget>
<output>50</output>

<result>50</result>