Answers

2014-08-03T20:06:18+08:00
According to me the answer is 4
0
2014-08-03T21:49:57+08:00
4 = 2·2
8 = 2·2·2
12 = 2·2·3
16 = 2·2·2·2
28 = 2·2·7
LCD = 2·2·2·2·3·7 = 336 :) 
0