A 0.5-meter-long cuboid wood has a square cross-section. If it is sawed into two pieces on average, the surface area will increase by 30 square centimeters. What is the original volume of this wood in cubic centimeters?
一根长0.5米的长方体木料横截面是正方形，把它平均锯成两段，表面积比原来增加30平方厘米，原来这根木料的体积是多少立方厘米．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">0.5 * 100</gadget>
<output>50</output>

<gadget id="calculator">15 * 50</gadget>
<output>750</output>

<result>750</result>