cuboid glass fish tank (without cover) is 5 decimeters long, 4 decimeters wide, and 4 decimeters high. How many square decimeters of glass do you need to make such a fish tank?
一个长方体玻璃鱼缸，(无盖)长5分米，宽4分米，高4分米，做这样的一个鱼缸需要用多少平方分米的玻璃？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">20 + 16</gadget>
<output>36</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<gadget id="calculator">20 + 72</gadget>
<output>92</output>

<result>92</result>