If a 3-meter-long cuboid is sawed into 3 sections, the surface area increases by 12 square decimeters, and how many square decimeters does the surface area increase after sawing into 6 sections?
把一根长3米的长方体木料锯成3段后，表面积增加12平方分米，锯成6段后表面积增加多少平方分米．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<result>30</result>