rope, cut half of it for the first time, cut 4 meters for the second time, and finally left 2 meters. How long is the rope in meters?
一根绳子，第一次剪去一半，第二次剪去4米，最后剩下2米．原来绳长多少米．
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>