After cutting off (1/5) of a rope, (4/5) meters are left, how many meters is this rope originally?
一根绳子剪去它的(1/5)后，剩下(4/5)米，这根绳子原来长多少米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

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

<result>1</result>