A log with a length of 15 meters is sawed into 3 sections on average, and the surface area is increased by 60 square decimeters. What is the volume of the log in cubic meters?
把一根长15米的圆木平均锯成3段，表面积增加60平方分米，原来这根圆木的体积是多少立方米？
<gadget id="calculator">60 / 4 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * 15</gadget>
<output>9/4 = around 2.25</output>

<result>9/4 = around 2.25</result>