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panjang keramik 40 cm= 0.4 m
panjang lantai=3.2 : 0.4 = 8 keramik
lebar lantai =2.8 : 0.4 = 7 keramik
luas lantai= 8 kali 7 =56 keramik
jadi,banyak keramik yang diperlukan adalah 56 keramik.