If a log 15 meters long is cut into 3 small logs, the surface area increases by 24 square decimeters, what is the original volume of the log in cubic decimeters?
把一根长15米的圆木截成3段小圆木，表面积增加24平方分米，这根圆木原来的体积是多少立方分米．
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">6 * 150</gadget>
<output>900</output>

<result>900</result>