Question

12 : ( x + 2) = 78/26
berapakah nilai x

40 : ( n + 3) = 5/2
berapakah nilai n

Answer 1

⇒ 12 : ( x + 2) = 78/26   
   12              78
----------  =  ------------
(x + 2)           26

12 x 26 = 78(x + 2)
312 = 78x + 156
78x = 312 - 156
78x = 156
x = 156/78
x = 2


⇒ 40 : ( n + 3) = 5/2
   40              5
----------  =  ------------
(n + 3)           2
40 x 2 = 5(n + 3)
80 = 5n + 15
5n = 80 - 15
5n = 65
n = 65/5
n = 13

Answer 2

40 : (n+3) = 5/2
5(n+3) = 2 . 40
5n + 15 = 80
        5n = 80 - 15
          n = 65/5
          n = 13