Jawabanmu

2014-04-10T19:33:40+07:00
N X : n O = 2 : 3
(m/Ar)X : (m/Ar)O = 2 : 3
18/ArX : 16/16 = 2 : 3
18/ArX = 2/3
ArX = 18 x 3/2 = 27
1 5 1