A long rope, cut off the full length (1/10) for the first time, and cut off the full length (1/5) for the second time, there is still 7 meters left, how many meters is the total length of the rope?
一根长绳，第一次截去全长的(1/10)，第二次截去全长的(1/5)，还剩下7米，这根绳子全长多少米？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/10) - (1/5)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">7 / (7/10)</gadget>
<output>10</output>

<result>10</result>