a:b=4:5,a+b=90,dan b=1/2 c
tentukan nilai a,b,c
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a + b = 90 ⇒ b = 90 - a
b = 1/2 c⇒ 90 - a = 1/2 c
⇒ 180- 2a = c
apabila, a/b = 4/5
5a =4b
5a = 4 (90 - a)
5a = 360 - 4a
9a = 360
a = 40
jadi, b = 90- a = 50
b = 1/2 c
50 x 2 =c
100 = c