A 2m long cylindrical wood, after sawing it into 4 equal sections, the surface area is 7.5dm2 more than the original. What is the volume of this piece of wood dm**3?
一根2m长的圆柱体木料，把它锯成相等的4段后，表面积比原来多了7.5dm**2．原来这根木料的体积是多少dm**3？
<gadget id="calculator">7.5 / 6</gadget>
<output>1.25</output>

<gadget id="calculator">1.25 * 2 * 10</gadget>
<output>25</output>

<result>25</result>