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volume 1/6 drum = 1/6 x phi x r² x t
= 1/6 x 22/7 x 28 x 28 x 84
= 34496 cm³
1/4×22/7×56²×84
206976 cm³
minyak terjual = 5/6×206976
=172480 cm³
sisa volume - minyak terjual = 34492 cm ³