The toy factory originally planned to produce 700 toy cars in 28 days, but the actual work efficiency was doubled. How many days did it take?
玩具厂原计划28天生产玩具车700辆，实际工作效率提高到原计划的2倍，实际几天完成？
<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<result>14</result>