A wire is cut off (3/5) meters for the first time, and 1.8 meters for the second time, and 40% of the total length is cut off twice. How long is this wire?
一根铁丝第一次截去(3/5)米，第二次截去1.8米，两次共截去全长的40%．这根铁丝原来长多少米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) + 1.8</gadget>
<output>2.4</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2.4 / (2/5)</gadget>
<output>6</output>

<result>6</result>