A rectangular parallelepiped glass container has a length of 4dm and a width of 5dm measured from the inside. Pour 25L of water into the container and put an apple into the water. 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，从里面量长为4dm，宽均为5dm，向容器中倒入25L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">4 * 5 * (3/2)</gadget>
<output>30</output>

<gadget id="calculator">30 - 25</gadget>
<output>5</output>

<result>5</result>