It is given that
Internal radius of the hemispherical bowl = 9cm
Diameter of the hemispherical bowl = 9/2 = 4.5 cm
Diameter of the bottle = 3cm
Radius of the bottle = 3/2 = 1.5cm
Height of the bottle = 4cm
We know that
Number of bottles = Volume of bowl/ Volume of each bottle
So we get
Number of bottles = (2/3 πR3)/ (πr2h)
By substituting the values
Number of bottles = (2/3 π (9)3)/ (π (3/2)2h)
On further calculation
Number of bottles = (2/3 (9)3)/ ((3/2)2h)
So we get
Number of bottles = 54
Therefore, 54 bottles are required to empty the bowl.