The living room of Xiaohong’s house is rectangular, 3 meters wide, and 4 times as long as the width. Dad wants to paste beautiful decorative wooden strips around the roof. How long are the wooden strips needed?
小红家的客厅是长方形的，宽3米，长是宽的4倍，爸爸想在房顶的四周贴上漂亮的装饰木条，需要多长的木条？
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>