When building a road, when it reaches (3/4) of this road, there are still 30 meters away from the end point. How long is this road in meters?
修一条路，当修到这条路的(3/4)时，离终点还有30米，这条路长多少米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">30 / (1/4)</gadget>
<output>120</output>

<result>120</result>