18 is the answer. The pattern is alternating adding and subtracting the list of prime numbers.
14 18 20
18. The pattern is add 5, then subtract 1.
6100
31
456789
140
10
Next is xx which is 20 xix = 10 + (10-1) = 19
20
1
22
0.1 These are all powers of 10: 10^3 = 1000 10^2 = 100 10^1 = 10 10^0 = 1 10^-1 = 0.1