cuboid with a length of 50 cm is cut horizontally into two pieces of equal size, and the surface area is increased by 100 cm2. What is the volume of this cuboid in cubic decimeters?
一个长50厘米的长方体木块，横着截成两块大小相等的两块，表面积增加了100平方厘米，这根长方体木块的体积是多少立方分米．
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 / 1_000</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">50 * (1/20)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>