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panjang sisi = 6 m = 600 cm
ukuran ubin = 30 x 30
maka :
L lantai = 600 x 600 = 360.000 cm³
L ubin = 30 x 30 = 900 cm³
maka banyak ubin y dibuthkan = 360.000 / 900 = 400 buah