First pour 300ml of water into a measuring cup with a capacity of 700ml, and then completely immerse an apple in the water. At this time, the capacity of the measuring cup is measured to be 550ml. What is the volume of the apple in cm**3.
在一个容积700ml的量杯里先注入300ml的水，然后把一个苹果完全浸入水里，这时测得量杯里的容量为550ml，这个苹果的体积是多少cm**3．
<gadget id="calculator">550 - 300</gadget>
<output>250</output>

<result>250</result>