There is a rope minus half, and then cut off the remaining half, leaving 4 meters. How long is this rope?
有一根绳子减去一半，再剪去余下的一半，还剩下4米．这根绳子原来长多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / (1/2) / (1/2)</gadget>
<output>16</output>

<result>16</result>