A cuboid wood block, after sawing off 5cm, obtains a cube wood block, whose surface area is reduced by 100cm**2 from the original one, find the surface area of the original cuboid block.
一个长方体木块，锯掉5cm后，得到一个正方体木块，表面积比原来减少100cm**2，求原来长方体木块的表面积．
<gadget id="calculator">100 / 4 / 5</gadget>
<output>5</output>

<gadget id="calculator">5 * 5 * 2</gadget>
<output>50</output>

<gadget id="calculator">5 + 5</gadget>
<output>10</output>

<gadget id="calculator">5 * 10 * 4</gadget>
<output>200</output>

<gadget id="calculator">50 + 200</gadget>
<output>250</output>

<result>250</result>