road has been built (3/5), which is exactly 540 meters. How many meters is the total length of this road? (Solution of column equation)
修一条路，已经修了(3/5)，正好是540米，这条路全长多少米？(列方程解)
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">540 / (3/5)</gadget>
<output>900</output>

<result>900</result>