rectangular parallelepiped glass container has a length, width, and height of 2dm from the inside. Pour 5.5L of water into the container, and then put an apple in it. The water depth in the container is measured to be 15cm. What is the volume of the apple?
一个长方体玻璃容器，从里面量长、宽、高均为2dm，向容器中倒入5.5L水，再放入一个苹果，这时量得容器内的水深是15cm，这个苹果的体积是多少？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">5.5 / 4</gadget>
<output>1.375</output>

<gadget id="calculator">1.5 - 1.375</gadget>
<output>0.125</output>

<gadget id="calculator">2 * 2 * 0.125</gadget>
<output>0.5</output>

<result>0.5</result>