One rope is 8.4 meters long and the other rope is 0.5 meters longer than it. How many meters are there in total?
一根绳子长8.4米，另一根绳子比它长0.5米，两根绳子一共有多少米？
<gadget id="calculator">8.4 + 0.5 + 8.4</gadget>
<output>17.3</output>

<result>17.3</result>