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luas EFGH = p x l
60 = 15 x l
l = 60/15
l = 4 cm
luas DCGH = p x t
120 = 15 x t
t = 120/15
t = 8 cm
volume balok = p x l x t
= 15 x 4 x 8
= 480 cm³
semoga membantu ya :)