A rectangular parallelepiped glass container, measured from the inside, is 3dm in length and width. Pour 13L of water into the container, and then put an apple into the water. At this time, the water depth in the container is measured to be 15cm. What is the volume of this apple?
一个长方体玻璃容器，从里面量长、宽均为3dm，向容器中倒入13L水，再把一个苹果放入水中，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">15 / 10</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">3 * 3 * (3/2)</gadget>
<output>27/2 = around 13.5</output>

<gadget id="calculator">(27/2) - 13</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>