A square lawn with a side length of 30 meters is to be dug out to a square lawn with a side length of 5 meters. What is the perimeter of the remaining small lawn?
一块边长是30米的正方形草坪，要挖出一个边长是5米的正方形草坪，剩下小草坪的周长是多少米．
<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">120 + 20</gadget>
<output>140</output>

<result>140</result>