Jawabanmu

2014-08-15T17:15:35+07:00
Lebar = 5 cm
15x12 : 4x5
180 m  : 20 cm
maaf jika salah
2014-08-15T17:20:09+07:00
15 m = 150 cm
12 m = 120 cm

120 = 4
150 = x

150 . 4 = 120 x
600 = 120x
5 = x

luas = 150.120 = 18000
luas = 5.4 = 20

18000 : 20
900 : 1