18 - 16 = 2 14 / 2 = 7 17 + 7 = 24
12 11 18 14 24 17 30 20.. i think ;-) pattern: 18-12 = 6 14-11 = 3 24-18 = 6 17-14 = 3 i hope that helps.
it is 17 because if you say 31 -14 =17 .... 17+14=31
16
(21+15+19+28+10+17+9+15+26+14+10+18+24+12+16) / 15 = 16.93 recurring (that is, 16.93333...)
17
30
24
24 + 17 = 41 2/4 + 1/7 = 14/28 + 4/28 = 18/28 = 9/14
14
the answer is 12
16