A rope, (2/5) is 2 meters longer than the used one, and the rest is 6 meters longer than the used one. How long is the rope in meters?
一根绳子，用去它的(2/5)多2米，余下的比用去的多6米，这根绳子长多少米．
<gadget id="calculator">6 + 2 + 2</gadget>
<output>10</output>

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

<gadget id="calculator">1 - (2/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<result>50</result>