A cuboid wooden box has a length of 20dm, a width of 5dm, and a height of 3dm. How many square decimeters of wood should be used to make this wooden box?
一只长方体木箱，长20dm，宽5dm，高3dm，做这只木箱至少要用多少平方分米的木板？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">100 + 60 + 15</gadget>
<output>175</output>

<gadget id="calculator">175 * 2</gadget>
<output>350</output>

<result>350</result>