The road repair team repaired a section of road, 30% of the total length was repaired on the first day, and 25% of the total length was repaired on the second day. It is known that 400 meters were repaired the next day. How many meters did you repair on the first day?
修路队修一段路，第一天修了全长的30%，第二天修了全长的25%．已知第二天修了400米．第一天修了多少米？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">400 / (1/4)</gadget>
<output>1_600</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1_600 * (3/10)</gadget>
<output>480</output>

<result>480</result>