cuboid glass container, measured from the inside, is 4dm in length and width. Pour 12.5L of water into the container, and then put a pear into the water. At this time, the water depth in the container is 1.25dm. Find the volume of the pear in cubic decimeter?
一个长方体玻璃容器，从里面量长、宽均为4dm，向容器中倒入12.5L水，再把一个梨放入水中，这时容器内的水深为1.25dm，求这个梨的体积是多少立方分米？
<gadget id="calculator">4 * 4 * 1.25</gadget>
<output>20</output>

<gadget id="calculator">20 - 12.5</gadget>
<output>7.5</output>

<result>7.5</result>