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376= 2(80 + 10t + 8t)
376= 160 + 20t + 16t
376= 160 + 36t
36t= 376 -160
36t= 216
t= 216/36
t= 6cm
V. balok= p × l × t
V.balok= 10 × 8 × 6
V. balok= 480 cm³