There is a cuboid whose base is a square and whose surface area is 190 square centimeters. 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 centimeters. Find the original cuboid height of.
有一个长方体，它的底面是一个正方形，它的表面积是190平方厘米，如果用一个平行于底面的平面将它截成两个长方体，则两个长方体表面积的和是240平方厘米，求原来长方体的高．
<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>

<result>7</result>