A road is built, 45 meters per day, after 4 days, 25% of the road remains unrepaired, how many meters is the total length of this road?
修一条路，每天修45米，修了4天，还剩下25%没有修，这条路共长多少米？
<gadget id="calculator">45 * 4</gadget>
<output>180</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">180 / (3/4)</gadget>
<output>240</output>

<result>240</result>