Master Wang plans to produce a batch of parts, 200 parts per day, and it can be completed in 20 days. Actually, 50 more parts per day, how many days can it be completed? (Solve with ratio)
王师傅计划生产一批零件，每天做200个，20天可以完成，实际每天多做50个，几天可以做完？(用比例解)
<gadget id="calculator">200 * 20</gadget>
<output>4_000</output>

<gadget id="calculator">200 + 50</gadget>
<output>250</output>

<gadget id="calculator">4_000 / 250</gadget>
<output>16</output>

<result>16</result>