A wire is 20 meters long, 3.8 meters are cut for the first time, and 4.15 meters are cut for the second time. Compared with the original wire, how many meters is shorter.
一根电线长20米，第一次剪去3.8米，第二次剪去4.15米，这根电线和原来相比，短了多少米．
<gadget id="calculator">3.8 + 4.15</gadget>
<output>7.95</output>

<result>7.95</result>