wire is 200 meters long, use the full length (2/5) for the first time, and use the remaining half for the second time. How much rice did you use the second time?
一根电线长200米，第一次用去全长的(2/5)，第二次用去剩下的一半．第二次用去多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">200 * (2/5)</gadget>
<output>80</output>

<gadget id="calculator">200 - 80</gadget>
<output>120</output>

<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<result>60</result>