Question

12/k=3/4 ; 18/w=3/4

Answer 1

12      3
---- = ---
k        4

12 x 4 = 3 x K
48 = 3k
k = 48/3
k = 16

18      3
--- =  ----
w        4

18 x 4 = 3 x W
72 = 3w
w = 72/3 
W = 24

Answer 2

12 = 3 ==> 3k = 12.4 ==> 3k = 48 ==> k = 16
 k     4
========================================================
18 =  3  ==> 3w = 18.4 ==> 3w = 72 ==> w = 24
 w     4