To produce a batch of parts, we can produce 200 parts per day, which can be completed in 15 days, and the actual production exceeds 50 parts per day, so how many days can it be completed?
生产一批零件，我们每天生产200个，15天可完成，实际每天超产50个，那么多少天可以完成？
<gadget id="calculator">200 + 50</gadget>
<output>250</output>

<gadget id="calculator">15 / 250</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">200 * (3/50)</gadget>
<output>12</output>

<result>12</result>