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luas keramik = 20 cm x 20 cm = 400 cm²
banyak keramik = luas lantai / luas keramik
= 64.000 / 400
= 160 buah
semoga membantu ya :)
3,2m = 320cm
L = 200 x320
= 64.000cm²
Luas keramik = 20 x 20
= 400cm²
64.000 : 400 = 160 keramik