To produce a batch of parts, the original plan was to produce 160 parts per day, and it was completed in 15 days. In fact, 40 more parts were produced per day, and how many days were actually completed? (Solve with ratio)
生产一批零件，原计划每天生产160个，15天完成，实际每天多生产40个，实际几天完成？(用比例解)
<gadget id="calculator">160 * 15</gadget>
<output>2_400</output>

<gadget id="calculator">160 + 40</gadget>
<output>200</output>

<gadget id="calculator">2_400 / 200</gadget>
<output>12</output>

<result>12</result>