For a rope, (2/5) is used up by 5 meters, and the remaining (1/3) is 9 meters. What is the total length of the rope?
一根绳子，用去它的(2/5)多5米，还剩它的(1/3)多9米，这根绳子全长多少米．
<gadget id="calculator">5 + 9</gadget>
<output>14</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">1 - (2/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">14 / (4/15)</gadget>
<output>105/2 = around 52.5</output>

<result>105/2 = around 52.5</result>