If a piece of wood with a cross section of 6dm**2 and a length of 4m is cut into 3 sections, how much will the surface area increase by dm**2?
把横截面是6dm**2，长是4m的一根木料横锯成3段，表面积增加多少dm**2．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>