A factory processes a batch of parts. The original plan is to process 150 parts per day, and it will be completed in 20 days. The actual processing is 50 more than the original plan every day, and how many days are actually completed?
某工厂加工一批零件，原计划每天加工150个，20天完成．实际每天比原计划多加工50个，实际多少天完成？
<gadget id="calculator">150 + 50</gadget>
<output>200</output>

<gadget id="calculator">20 / 200</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">150 * (1/10)</gadget>
<output>15</output>

<result>15</result>