Question

Jika diketahui a:b = 4: 5,a+b= 90 c = 1/2b , maka nailai a,b,dan c adalah

Answer 1

A : b = 4 : 5
     b : c = 2 : 1 (kebalikan dari 1/2)
a : b : c = (4 x 2) : (5 x 2) : (5 x 1)
            = 8 : 10 : 5
a = a / a + b x 90
  = 8 / 8 + 10 x 90
  = 8/18 x 90
  = 8 x 5
  = 40
b = 10/18 x 90
  = 10 x 5
  = 50
c = 5/18 x 90
  = 5 x 5
  = 25

Kalo ada yang bingung tanya aja!

Answer 2

A / b = 4 : 5 >> 5a = 4b
a + b = 90
4b/5 + b = 90
9b/5 = 90
b = 50
a = 40
c = 1/2 b
= 1/2 x 50
= 25