Required Mathematical Intelligence

Chapter 20 Measuring Volume

There is a medicine bottle with a scale on it, and the volume of the medicine inside can be seen from the scale.But this scale is not from the bottom of the bottle to the top of the bottle, and the mouth of the bottle is smaller than the bottom, how can the volume of the bottle be calculated?
[Answer: first measure the volume of the medicine inside with the mouth of the bottle facing up and set it as V1, then turn the bottle upside down, the volume of the medicine in the bottle is still V1 at this time; while the volume of the upper part can be seen from the scale, set it as V2 , then the volume of the bottle is equal to V1+ V2.]
(End of this chapter)