22

It is a pattern.

22,logic is 10-2=8-1=7*2=14+1=15-2=13-1=12*2=24+1=25-2=23-1=
(22)

10-2=8-1=7*2=14+1=15-2=13-1=12*2=24+1=25-2=23-1=22

answer=22

10-2=8,8-1=7,7x2=14,14+1=15,15-2=13,13-
1=12,12x2=24,24+1=25,25-2=23 which conclude that starting 
with -2,-1,x2,+1,-2,-1,x2,+1,-2, now it is -1, therefore 
the required digit is 23-1=22

0

9,10,8,7,14,15,13,12,24,25,23,22 so 22 will be the next 
sequence ......one digit will go straight with other number 
and same other digit will go reverse with other number

10,8,7,14,15,13,12,24,25,23,22,44.