A rope is cut off by 20% and then connected to 5 meters, which is shorter than the original (3/20), how many meters is the rope now?
一根绳子剪去20%后又接上5米，比原来短(3/20)，则现在绳长多少米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(1/5) - (3/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">5 / (1/20)</gadget>
<output>100</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">100 * (17/20)</gadget>
<output>85</output>

<result>85</result>