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luas keramik = 40cm x 40cm = 1600 cm
banyak keramik nya = 18600/1600 = 56 buah keramik
semoga membantu
= 89.600 cm2
luas keramik = 40 cm * 40 cm = 1.600 cm2
banyak keramik = 89.600 cm2 : 1.600 cm2 = 56 keramik