To build a road, if it is 60 meters a day, it can be completed in 20 days. If it is required to be completed 4 days in advance, how many meters will be repaired every day?
修一条公路，如果每天修60米，20天能修完，如果要求提前4天完成，每天要修多少米？
<gadget id="calculator">60 * 20</gadget>
<output>1_200</output>

<gadget id="calculator">20 - 4</gadget>
<output>16</output>

<gadget id="calculator">1_200 / 16</gadget>
<output>75</output>

<result>75</result>