A wire is 80 meters long, the first cut off the full length (2/5), and the second cut off the rest (1/4), how many meters is left on this wire?
一根电线长80米，第一次截去的全长的(2/5)，第二次截去了余下的(1/4)，这根电线还剩多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/5) * (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (2/5) - (3/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">80 * (9/20)</gadget>
<output>36</output>

<result>36</result>