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Verified answer
V. balok 1 = p x l x t= 35 x 15 x (20 - 10)
= 5250 cm³
V. balok 2 = p x l x t
= 8 x 15 x 10
= 1200 cm³
V. balok 3 = p x l x t
= 7 x 15 x 10
= 1050 cm³
V.tot = 5250 + 1200 + 1050
= 7500 cm³