Jawabanmu

2014-05-25T19:20:17+07:00
Diketahui
2,8 m = 280 cm
3,2 m = 320 cm

luas lantai = 280 x 320 = 89.600 cm²
luas keramik = 40 x 40 = 1.600 cm²

89.600 : 1. 600 = 56 keramik
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