Please help with solving this problem...

The bottle is separated into 2 separate cylinders for measuring ie the lower larger part and the upper neck or smaller part

the dimensions of the bottle are :

1) bottle height = 27 cm

2) base diameter = 7 cm

3) bottle top diameter = 4 cm

dimensions of liquid inside bottle :

1) large cylinder : 20 cm

2) small cylinder or neck of bottle : 3 cm

thank you

Stirling