rope is 6 meters long, and 1.8 meters are cut off, how many meters are left over the cut?
一条绳长6米，剪去1.8米，剩下的比剪去的多多少米？
<gadget id="calculator">6 - 1.8 - 1.8</gadget>
<output>2.4</output>

<result>2.4</result>