A cylindrical iron rod with a length of 1 meter is sawed into 4 sections, each section is still a cylinder, and the surface area is increased by 24 square centimeters compared with the original one, find the volume of this iron rod in cubic decimeters.
把一根长1米的圆柱形铁棒锯成4段，每段仍是圆柱体，表面积比原来增加了24平方厘米，求，这根铁棒的体积多少立方分米．
<gadget id="calculator">24 / 6</gadget>
<output>4</output>

<gadget id="calculator">100 / 1_000</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">4 * 1 * (1/10)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>