A rectangular glass jar is 2.5dm long and 1.5dm wide from the inside. Pour 4.5 liters of water into the jar, and then put an apple (completely submerged). At this time, the water depth in the jar is measured to be 13cm. What is the volume of the apple?
一个长方形玻璃缸，从里面量长2.5dm，宽1.5dm，向缸内倒入4.5升水，再放入一个苹果(完全浸没)，这时测得缸内水深13cm，这个苹果的体积是多少．
<gadget id="calculator">13 / 10</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">2.5 * 1.5 * (13/10)</gadget>
<output>4.875</output>

<gadget id="calculator">4.875 - 4.5</gadget>
<output>0.375</output>

<result>0.375</result>