Jawabanmu

2014-01-17T15:18:12+07:00
e)   \frac{a}{c} = \frac{5}{7}  \\ a= \frac{5}{7} c \\  \\ a+c=144 \\  \frac{5}{7}c+c=144 \\ c=84 \\  \\ a+c=144 \\ a+84=144 \\ a=60 \\  \\ b= \frac{1}{6}  (a+c) \\ b= \frac{1}{6} (144) \\ b=24
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