A rope, cut off (1/4), it is exactly (1/5) meter, how many meters is this rope? What is the correct column
一根绳子，剪去(1/4)，恰好是(1/5)米，这根绳子长多少米？正确的列式是多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) / (1/4)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>