There are two iron wires of the same length, the first one minus 30 cm, the second minus 18 cm, the remaining length of the second wire is twice the remaining length of the first wire, how many centimeters are left in the second wire?
有两根同样长的铁丝，第一根减去30厘米，第二根减去18厘米，第二根余下的是第一根所余下长度的2倍，第二根铁丝还剩多少厘米？
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">18 / 1</gadget>
<output>18</output>

<gadget id="calculator">30 - 18</gadget>
<output>12</output>

<gadget id="calculator">12 + 12</gadget>
<output>24</output>

<result>24</result>