Solution:

Volume of 150 spherical marbles, each of diameters 1.4 cm = volume of cylindrical vessel of diameter 7 cm

150 x 4/3 x pie x 1.4/2 x 1.4/2 x1.4/2 = pie x 7/2 x 7/2 x h

h = 5.6 cm

Volume of 150 spherical marbles, each of diameters 1.4 cm = volume of cylindrical vessel of diameter 7 cm

150 x 4/3 x pie x 1.4/2 x 1.4/2 x1.4/2 = pie x 7/2 x 7/2 x h

h = 5.6 cm