A cuboid has a square base, the sum of the areas of the front, rear, left, and right sides is 80 decimeters squared, and the height is 4 decimeters. What is its volume in cubic decimeters?
一个长方体底面是正方形，前后左右四个面的面积总和是80平方分米，高4分米，它的体积是多少立方分米．
<gadget id="calculator">80 / 4 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 * 5 * 4</gadget>
<output>100</output>

<result>100</result>