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luas lantai ruangan/ luas ubin
jml= 450 cm x 300 cm / 30 cmx 30 cm
= 150 buah
3m=300cm
L1=pxl
450cmx300cm
135.000cm
L2=pxl
30cmx30cm
900cm
maka
L1:L2
135.000cm:900cm
=150 ubin