A rope is cut off by 19.5 meters, which is 3.4 meters shorter than the rest. How long is this rope?
一根绳子剪去19.5米，比剩下的短3.4米．这根绳子原来长多少米？
<gadget id="calculator">19.5 + 3.4 + 19.5</gadget>
<output>42.4</output>

<result>42.4</result>