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ukuran bak = 3 x 1 x 4
bersisi = 3/4
maka :
A. V bak penuh = 3 x 1 x 4 = 12 m³ = 12.000 liter
B . V air = 3/4 x 12.000 = 9.000 liter
catatn = 1 m³ = 1.000 liter