A workshop needs to produce a batch of parts, and plans to produce 200 parts per day, and the task will be completed in 20 days. The actual production is 50 more than the original plan every day, and the task can be completed in a few days less?
某车间要生产一批零件，计划每天生产200个，20天完成任务．实际每天比原计划多生产50个，实际少用几天就完成任务？
<gadget id="calculator">200 + 50</gadget>
<output>250</output>

<gadget id="calculator">20 / 250</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">200 * (2/25)</gadget>
<output>16</output>

<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<result>4</result>