A cuboid wood block is sawn off 2 cm along its height to become a cube, and its surface area is reduced by 40 square centimeters. Find the volume of the original cuboid block.
一块长方体木块，沿着高锯掉2厘米后，成为一个正方体，表面积减少40平方厘米，求原来长方体木块的体积．
<gadget id="calculator">40 / 4 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">5 * 5 * 7</gadget>
<output>175</output>

<result>175</result>