Pour 200ml of water into a measuring cup with a volume of 500ml, and then put a potato in it. At this time, the capacity of the measuring cup is 350ml. What is the volume of the potato in cm**2.
把一个容积是500ml的量杯里先注入200ml的水，然后放入一个土豆，这时测量杯里的容量为350ml，这个土豆的体积是多少cm**2．
<gadget id="calculator">350 - 200</gadget>
<output>150</output>

<result>150</result>