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Cylinder A has a radius of $r$ and a height of $h$ . Cylinder B has a radius of $2 r$ and a height of $H_{B}$ . Cylinder C has a radius of $R_{C}$ and a height of $3 h$ . If the volume of Cylinder B is 4 times the volume of Cylinder A, and the volume of Cylinder C is 9 times the volume of Cylinder B, what is $R_{C}$ in terms of $r$ ?