metal oil tank in the shape of a cuboid with a cover is 3 decimeters in length and width and 8 decimeters in height. How much iron sheet is needed to make a fuel tank like this?
一个有盖的长方体形状的铁皮油箱，长和宽都是3分米，高8分米．做一个这样的油箱至少需要多少铁皮？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">3 * 8</gadget>
<output>24</output>

<gadget id="calculator">9 + 24 + 24</gadget>
<output>57</output>

<gadget id="calculator">57 * 2</gadget>
<output>114</output>

<result>114</result>