cuboid pool is a square with a circumference of 20 meters on the ground, and the sum of the surrounding side areas is 300 square meters. How many cubic meters of water can this pool hold?
一长方体的水池，地面上周长20米的正方形，四周的侧面积之和是300平方米，这个水池能装多少立方米的水？
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 * 1.5</gadget>
<output>37.5</output>

<result>37.5</result>