After cutting a 5-meter-long cuboid into two pieces, the surface area increases by 2.4 square decimeters compared to the original one. What is the volume of this piece of wood?
把一根5米长的长方体木材截成两段后，表面积比原来增加了2.4平方分米，这根木材的体积是多少．
<gadget id="calculator">2.4 / 2</gadget>
<output>1.2</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">1.2 * 50</gadget>
<output>60</output>

<result>60</result>