A rope is used up (7/8) meters, and the full length (7/8) remains. How long is this rope in meters?
一根绳子用去(7/8)米，还剩下全长的(7/8)．这根绳子原来长多少米．
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 - (7/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(7/8) / (1/8)</gadget>
<output>7</output>

<result>7</result>