A bundle of wires uses up the full length (3/5), and there is still 30 meters left. How many meters is the total length of this bundle of wires?
一捆电线，用去全长的(3/5)，还剩下30米，这捆电线全长有多少米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 / (2/5)</gadget>
<output>75</output>

<result>75</result>