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Luas lantai= 200 cm* 320 cm= 64000 cm²
banyak ubin yang diperlukan
= Luas lantai/ Luas ubin
= 64000 cm²/400 cm²
= 160 buah
jadi 200 cm dan 320 cm
L permukaan lantai (L2)
200 x 320 = 64.000 cm
cari luas ubin (L3)
200 x 200 = 400 cm
L1 = L2 : L3
= 64.000 : 400 = 160