4. Solution: Using the rising height of the cylinder water surface, the volume of boiling water in the cone can be calculated, that is, the volume of the cone.

v = sh 1 = 3. 14 * 6 * 6 * 2.5 = 3. 14 * 90

The formula of cone volume is V= 1/3SH2, so 3.14 * 90 =1/3 * 3.14 * 5 * H2, H2 =10.8cm. ..

Solution: When the bottle is placed upright, the volume of the beverage is S*20.

When the bottle is inverted, the volume of beverage plus the volume of spare parts is equal to the volume of the beverage bottle. That is: 20S+S*4=480, then S=20, then S*20=20*20=400, that is, there are 400 ml drinks now.