For a rope, the full length (1/3) is used for the first time, and 8 meters more than the first time for the second time. There are 12 meters left. How long is this rope in meters?
一根绳子，第一次用去全长的(1/3)，第二次比第一次多用8米．还剩12米．这根绳子全长多少米？
<gadget id="calculator">8 + 12</gadget>
<output>20</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">20 / (1/3)</gadget>
<output>60</output>

<result>60</result>