Question

Tentukan nilai x dan y berikut agar memenuhi perbandingan senilai :
a.) (x+3) : 5 = 63 : 45
b.) 39 : 91 = (y+1) : 7

Answer 1

A. (x+3)/5 = 63/45
   (x+3)/5 = 7 / 5
   x+ 3 = 7
  x = 4
b. 39/91 = (y+1)/7
   7 x 39/91 = y+1
  3 = y +1
 y = 2

Answer 2

A). (x+3) : 5 = 63 : 45
x + 3 = (63 : 45) x 5
x + 3 = (7 : 5) x 5 *sama2 bagi 9 yg di dalam kurubg.
x + 3 = 7
x = 7 - 3 -> x = 4

b). 39 : 91 = (y + 1) : 7
7 x 39 : 91 = y + 1
273 : 91 = y + 1
3 = y + 1
y = 3 - 1 -> y = 2