A cuboid has a length of 5 decimeters, a width of 4 decimeters, and a height of 3 decimeters. What is its surface area.
一个长方体的长是5分米，宽4分米，高3分米．它的表面积是多少．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

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

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">15 + 20 + 12</gadget>
<output>47</output>

<gadget id="calculator">47 * 2</gadget>
<output>94</output>

<result>94</result>