It took 5 days to build a road. At this time, the number of roads that have been repaired is three times that of the road that has not been repaired. What percentage has been repaired?
修一条路，修了5天，这时已修的是未修的3倍，已修了百分之几？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>