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= 2x24 = 48
v tabung = phi.r.r.t
= 3,14 . 12 . 12 . 48
= 21703 cm3
v 2 kelereng = 2 . 4/3 phi r . r . r
= 2 . 4/3 . 3,14 . 1728
= 14469 cm3
v sisa air = vtabung - 2vkelereng
= 21703 - 14469
= 7234 cm3
vtabung = phi . r . r . t
7234 = 3,14 . 12 . 12 . t
7234 = 452t
t = 16 cm