Answers

2015-08-26T18:23:06+08:00
9) 7 and 9
10) 1/2
11) 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
12) 60
13) 10, 12, 14, 16, 18
14) 12
15) 18
0