A cuboid has a surface area of 190 square decimeters and its base is a square. If it is cut into two cuboids by a plane parallel to the bottom, the sum of the surface areas of the two cuboids is 240 square decimeters. What is the volume of the original cuboid?
一个长方体，表面积是190平方分米，它的底面是一个正方形．如果用一个平行于底面的平面将它截成两个长方体，则这两个长方体的表面积的和为240平方分米．求原来长方体的体积是多少？
<gadget id="calculator">240 - 190</gadget>
<output>50</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">190 - 50</gadget>
<output>140</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">140 / 20</gadget>
<output>7</output>

<gadget id="calculator">25 * 7</gadget>
<output>175</output>

<result>175</result>