A rectangular vegetable field is fenced, the width is 12 meters, and the length is 4 times the width. How long should the fence be for this vegetable field?
给一个长方形菜地围篱笆，宽是12米，长是宽的4倍，应该为这块菜地围多长的篱笆？
<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">48 + 12</gadget>
<output>60</output>

<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<result>120</result>