Jawabanmu

2014-06-06T14:38:58+07:00
5a-b=24,
a:b=5:2,
c=1/7(a+b)

a/b = 5/2
a = 5b/2

5a - b = 24
5(5b/2) - b = 24
25b/2 - b = 24
25b - b = 24 x 2
24b = 48
b = 48/24
b = 2

5a - b = 24
5a - 2 = 24
5a = 24 + 2
5a = 26
a = 26/5
a = 5,2


c=1/7(a+b)
c = 1/7 (26/5 + 2)
c = 1/7 (36/5)
c = 36/35
c = 1,02