After a rectangle with a length of 30 cm and a width of 15 cm is surrounded by a piece of iron wire, there is still 20 cm left. What is the original length of the wire in cm?
用一根铁丝围成一个长30厘米，宽15厘米的长方形后，还剩下20厘米，这根铁丝原来的长度是多少厘米．
<gadget id="calculator">30 + 15</gadget>
<output>45</output>

<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<gadget id="calculator">90 + 20</gadget>
<output>110</output>

<result>110</result>