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Verified answer
22/7×7×7=22×7=154×24=3636r = 1/2d = 1/2 (14) = 7 dm
V.drum = π x r² x t
V.drum = 22/7 x 7² x 24
V.drum = 22/7 x 49 x 24
V.drum = 22 x 7 x 24
V.drum = 3696 dm³
V.drun = 3696 liter