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2014-05-05T15:54:46+07:00
2 m x 3,2 m 
200 x 320 = 64.000 cm
luas ubin = 20 x 20 = 400
jumlah ubin = 64.000 / 400
= 160
1 5 1
2014-05-05T15:55:28+07:00
Luas lantai = 200x320 = 64.000 <=> luas ubin = 20x20 = 400 cm.
maka banyak ubin = 64.000/400 = 160 buah