Cut off (4/5) of a rope, leaving (4/5) meters. How many meters is this rope?
一条绳剪去(4/5)，还剩(4/5)米．这条绳长多少米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

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

<result>4</result>