Question

Jika a= 5 per 7 , b = 1 per 2 , maka nilai c = a x ( b-c ) = .......

Answer 1

C = 5/7 (1/2 - c)
c = 5/14 - 5/7c
12/7 c = 5/14
       c  = 5/14 · 7/12
       c  =  5/24

Answer 2

C=a.(b-c)
c=ab-ac
c+ac=ab
c(1+a)=ab
c=ab/(1+a)
c=5/7×1/2 /(1+5/7)
c=5/14 / (7/7+5+7)
c=5/14/12/7
c=5/14×7/12
c=5/24