A rectangular parallelepiped glass container, measuring 2 decimeters in length and width from the inside, pours 5 liters of water into the container, and then puts a potato into the water. At this time, the water depth in the container was measured to be 13.5 cm. What is the volume of this potato?
一个长方体玻璃容器，从里面量长宽均为2分米，向容器中倒入5升水，再把一个土豆放入水中．这时量得容器内水深13.5厘米．这个土豆的体积是多少？
<gadget id="calculator">13.5 / 10</gadget>
<output>1.35</output>

<gadget id="calculator">2 * 2 * 1.35</gadget>
<output>5.4</output>

<gadget id="calculator">5.4 - 5</gadget>
<output>0.4</output>

<result>0.4</result>