Jawabanmu

2014-02-20T15:32:15+07:00
A + c = 144⇒ a = 144 - c
a : c = 5 : 7
b = 1/6 (a + c)
berarti,nilai b = 1/6 (144)
                 b = 24
kemudian:
a/ c = 5 / 7
7a = 5c
7 (144 - c) = 5c
1008 - 7c = 5c
1008 = 12c
c = 1008 / 12
c = 84

a +c =144
a= 144 - 84
a=60