After (2/3) of a rope is used up, there are 12 meters left, how many meters is this rope originally?
一根绳子用去(2/3)后，还剩12米，这根绳子原来有多少米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 / (1/3)</gadget>
<output>36</output>

<result>36</result>