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sisi keramik yang dibutuhkan = 60 cm lalu ubah ke meter = 60 / 100 = 0,6 m
dit: banyak keramik
jawab: banyak keramik = luas lantai rumah / luas keramik
= 3 × 3 / 0,6 × 0,6
= 9 / 0,36 = 25 keramik
L. keramik = 60 × 60 = 3.600 cm
90.000 : 3.600 = 25 keramik (C)