A ribbon with a length of 20 meters is cut off by 3.8 meters for the first time, and 2.7 meters more than the first time, how many meters are left?
一条长20米的彩带，第一次剪去3.8米，第二次比第一次多剪2.7米，还剩多少米？
<gadget id="calculator">3.8 + 2.7</gadget>
<output>6.5</output>

<gadget id="calculator">20 - 3.8 - 6.5</gadget>
<output>9.7</output>

<result>9.7</result>