wire is cut off 1.6 meters for the first time, and 0.8 meters for the second time, 40% of the total length is cut off twice. How long is this wire?
一根电线，第一次截去1.6米，第二次截去0.8米，两次共截去全长的40%，这根电线有多长？
<gadget id="calculator">1.6 + 0.8</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>