A 2-meter-long cylindrical log is sawn into 3 sections, and the surface area is increased by 30 square meters. What is the original volume of this log in cubic meters?
一根2米长的圆柱形木料锯成3段，表面积增加了30平方米，这根木料原来的体积是多少立方米．
<gadget id="calculator">30 / 4</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(15/2) * 2</gadget>
<output>15</output>

<result>15</result>