A bundle of wires is 200 meters long and (1/5) is used up. How much more rice is left over than used?
一捆电线长200米，用去了(1/5)．剩下的比用去的多多少米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">200 * (3/5)</gadget>
<output>120</output>

<result>120</result>