A cuboid box without a lid has a length of 6 decimeters, a width of 4 decimeters, and a height of 3.5 decimeters. What is its surface area in square decimeters?
一个长方体无盖包装盒，长是6分米，宽是4分米，高是3.5分米，它的表面积是多少平方分米．
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">6 * 3.5 * 2</gadget>
<output>42</output>

<gadget id="calculator">4 * 3.5 * 2</gadget>
<output>28</output>

<gadget id="calculator">24 + 42 + 28</gadget>
<output>94</output>

<result>94</result>