How many square decimeters of glass is needed to make a cuboid glass fish tank with a length of 5 decimeters, a width of 4 decimeters, and a height of 3 decimeters? (Retain the whole number of tens)
做一个长5分米、宽4分米、高3分米的长方体玻璃鱼缸，需要玻璃多少平方分米？(得数保留整十数)
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">4 * 3 * 2</gadget>
<output>24</output>

<gadget id="calculator">5 * 3 * 2</gadget>
<output>30</output>

<gadget id="calculator">20 + 24 + 30</gadget>
<output>74</output>

<result>74</result>