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We have, radius of the sphere, r = 30 cm Volume of the sphere = \frac{4}{3} {πr}^{3} = \frac{4}{3} \times π \times {(30)}^{3} = 36000 π {cm}^{3} Now, volume of cylinder = 7 \times Volume of the sphere \Rightarrow {πr}^{2} h = 7 \times 36000 π [where, r = radius of cylinder = 30 cm; h = height of cylinder] \Rightarrow {(30)}^{2} h = 252000 \Rightarrow h = \frac{252000}{900} = 280 So, height of cylinder = 280 cm

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