If a cuboid is cut into two small cuboids along its length, the surface area increases by 60 square decimeters. If the original cuboid is 3 meters long, what is its volume in cubic decimeters?
把一个长方体沿长切成两个小长方体，表面积增加了60平方分米，已知原长方体长3米，则它的体积是多少立方分米
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">30 * 30</gadget>
<output>900</output>

<result>900</result>