After a wire is used up (3/5), there are 6 meters left, how many meters is the wire originally?
一根电线用去(3/5)后，还剩6米，这根电线原来有多少米．
<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">6 / (2/5)</gadget>
<output>15</output>

<result>15</result>