Question

A right circular cylinder is partially filled with water. Two iron spherical balls are completely immersed in the water so that the height of the water in the cylinder rises by 4
cm. If the radius of one ball is half of the other and the diameter of the cylinder is 18 cm, then the radii of the spherical balls are

A 6 cm and 12 cm
B 4 cm and 8 cm
C 3 cm and 6 cm
D 2 cm and 4 cm
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