To build a road, the original plan was to build 4.5 meters per day and finish it in 12 days. How many days will it take to repair 6 meters per day?
修一条公路，原计划每天修4.5米，12天修完．实际每天修6米，多少天可以修完？
<gadget id="calculator">12 / 6</gadget>
<output>2</output>

<gadget id="calculator">4.5 * 2</gadget>
<output>9</output>

<result>9</result>