A rope is cut off by 2/5 and then connected to 5 meters, which is 3/20 shorter than the original one. How many meters is the rope now?
一根绳子剪去2/5后又接上5米，比原来短3/20，现在绳长多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) - (3/20)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5 / (1/4)</gadget>
<output>20</output>

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

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

<result>17</result>