A rope is cut off (1/5) for the first time, and (2/5) is cut off for the second time, what fraction is left?
一根绳子第一次截下它的(1/5)，第二次截下它的(2/5)，还剩几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/5) - (2/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>