A wire with a length of 200 meters is used for the first time (2/5), and the remaining (1/2) is used for the second time. How much more meters are used for the first time than the second time?
一根长200米的电线，第一次用去(2/5)，第二次用去余下的(1/2)，第一次比第二次多用去多少米？
<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">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">120 * (1/2)</gadget>
<output>60</output>

<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<result>20</result>