There are two ropes, the first is 16.2 meters long, which is twice the length of the second. What is the total length of these two ropes?
有两根绳子，第一根长16.2米，是第二根长度的2倍．这两根绳子共长多少？
<gadget id="calculator">16.2 / 2</gadget>
<output>8.1</output>

<gadget id="calculator">8.1 + 16.2</gadget>
<output>24.3</output>

<result>24.3</result>