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= p × l × t
= 60 × 30 × 50
= 90000 cm^3
Volume air
= 90000 × 2/3
= 60000 cm^3
Vol. aquarium - Vol. Air = Vol. balok
90000 - 60000 = p × l × t
30000 = (p × l) × 100 cm
30000 / 100 = p × l
300 cm^2 = p × l
P × l = luas alas balok, jadi luas alas balok = 300 cm^2