A batch of parts is produced, 200 parts are produced every day, and it takes 15 days to complete. Actually, 250 parts are produced every day. How many days can it be completed? (Formulated in proportion)
生产了一批零件，每天生产200个，15天完成，实际每天生产了250个，实际多少天可以完成？(用比例方式列式)
<gadget id="calculator">200 * 15</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 / 250</gadget>
<output>12</output>

<result>12</result>