A 3-meter-long square log is sawn into three 1-meter-long square logs, and the surface area is increased by 36 square meters compared with the original one. What is the original volume of the square log?
一根3米长的方木，锯成1米长的3根方木，表面积比原来增加了36平方米，方木原来的体积是多少？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">3 * 9</gadget>
<output>27</output>

<result>27</result>