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468 = 2(p × l) + (2(p + l) × t)
468 = 2(9 × 6) + (2(9 + 6) × t)
468 = 2(54) + (2(15) × t)
468 = 108 + (30 × t)
468 = 108 + 30t
30t = 468 - 108
30t = 360
t = 12
V = La × t
= p × l × t
= 9 × 6 × 12
= 54 × 12
= 648 cm²