A cuboid has a length of 6 decimeters, a width of 1.5 decimeters, and a height of 3 decimeters. What is its surface area in square decimeters?
一个长方体的长是6分米，宽1.5分米，高3分米，它的表面积是多少平方分米．
<gadget id="calculator">6 * 1.5</gadget>
<output>9</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">1.5 * 3</gadget>
<output>4.5</output>

<gadget id="calculator">9 + 18 + 4.5</gadget>
<output>31.5</output>

<gadget id="calculator">31.5 * 2</gadget>
<output>63</output>

<result>63</result>