The cross-sectional area of a square log is 20 decimeters**2. After cutting into 6 sections, the surface area will be increased by how many decimeters**2.
一根方木的横截面的面积是20分米**2，截成6段后，表面积比原来增加多少分米**2．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">20 * 5 * 2</gadget>
<output>200</output>

<result>200</result>