A rope is 100 meters long, 20 meters are cut off for the first time, and twice the length is cut the second time, how much shorter is the rope now than it was originally?
一根绳子长100米，第一次剪去20米，第二次剪去的是第一次的2倍，现在这根绳子比原来短多少米
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">20 + 40</gadget>
<output>60</output>

<result>60</result>