Jawabanmu

2014-01-29T04:36:33+07:00
Caranya si kurang tau, tapi kurang lebih gini lah
2:3 = 8&12 + 4 = 12 16 = 3:4

2014-01-29T09:20:54+07:00
A:b=2:3, maka a= \frac{2}{3} b
a+4:b+4=3:4

substitusikan nilai a
\frac{ \frac{2}{3} b+4} {b+4} = \frac{3}{4} \\ \frac{2}{3} b +4= \frac{3}{4}(b+4) \\ 12=9b-8b \\ 12=b \\ \\ a= \frac{2}{3} b \\ a=8