A piece of rope, cut off (4/5) of the full length, it is exactly (1/4) meter, how many meters is this rope?
一条绳子，剪去全长的(4/5)，刚好是(1/4)米，这条绳子长多少米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) / (4/5)</gadget>
<output>5/16 = around 0.3125</output>

<result>5/16 = around 0.3125</result>