The length of a cuboid advertising light box is 4 meters, the width is 0.5 meters, and the height is 2.4 meters. The frame of the light box is inlaid with aluminum strips, at least how many meters of aluminum strips are needed.
一个长方体广告灯箱的长是4米，宽是0.5米，高是2.4米．灯箱的框架用铝条镶嵌，至少需要多少米铝条．
<gadget id="calculator">4 + 0.5 + 2.4</gadget>
<output>6.9</output>

<gadget id="calculator">6.9 * 4</gadget>
<output>27.6</output>

<result>27.6</result>