Question

2. a:b = 8:6 ; b= 4/5c dan c-b = 4

3. a/b = b/c ; a+c = 15 dan a= 1/4c

tolong jawabin ya

Answer 1

1. C - B = 4
    B =  C - 4
    B = 4/5C
    C - 4 = 4/5C
    C - 4/5C = 4
    1/5C = 4
    C = 4 / (1/5) = 20
    
    C - B = 4
    20 - B = 4
    B = 20 - 4 = 16
  
    A/B = 8/6
    A/16 = 8/6
    6A = 8 * 16
    6A = 128
    A = 128 / 6 = 21,7

2.  A + C = 15       
    A = 15 - C
     A = 1/4C
      15 - C = 1/4C
       15 = C + 1/4C
       1,25C = 15
       C = 15 / 1,25 = 12
      A = 15 - C = 15 - 12 = 3
      A/B = B/C
      3/B = B/12
      3 * 12 = B * B
      B =  √(3 *12) =  √36 = 6