A piece of rope, cut off the full length (4/5), there are 3 meters left, how many meters is this rope?
一条绳子，剪去全长的(4/5)，还剩下3米，这条绳子长多少米？
<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">3 / (1/5)</gadget>
<output>15</output>

<result>15</result>