A rope uses up 1/3 of its total length and there are 4 meters more than the used one, and the rest is 10 meters longer than the used one.
一根绳用去了全长的(1/3)还多4米，剩下的比用去的多10米，这跟绳原长是多少米．
<gadget id="calculator">4 + 4 + 10</gadget>
<output>18</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">18 / (1/3)</gadget>
<output>54</output>

<result>54</result>