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= 240000
L persegi = 40.40 = 1600
240000/1600 = 150
= 600 cm x 400 cm
= 240.000 cm²
Luas 1 ubin = 40 cm x 40 cm = 1.600 cm²
Banyak ubin yang diperlukan:
= 240.000 : 1600
= 150 ubin