Jawabanmu

2014-09-11T12:48:25+07:00
250/20 : 50/x
250x = 1000
     x= 4 cm
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2014-09-11T12:49:58+07:00
P/l x pm/lm= 250m/50m x 20cm/X
25000cm/5000cm x 20cm/X
x X 25000 = 100000
x= 100000cm/25000cm
x=4 jadi lebar modelnya 4 cm
2 3 2