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(6x6)/(0,3x0,3 : 36/0,09 : 400
jadi .. perlu 400 ubin
luas sebuah lantai = 600cm x 600cm = 360000cm²
luas ubin = 30cm x 30cm = 900cm²
banyaknya ubin yang harus di beli = 360000cm² : 900cm² = 400 buah