Six tennis balls each of diameter 62mm are placed in a cylindrical tube Express the volume of un-filled space - Maths - Surface Areas and Volumes

Question

Six tennis balls each of diameter 62mm are placed in a cylindrical
tube Express the volume of un-filled space of cylinder in
percentage

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Six tennis balls each of diameter 62mm are placed in a cylindrical tube. Express the volume of un-filled space of cylinder in percentage.