Question

The numbers on both side of ':'have a relation between them. If pair of numbers on both side of'::'follow the same relation,then the number which replace the ?is
354:4::852:11::794:12::951:?
(1)15. (2)13
(3)12. (4)10

Answer 1

It's answer is 13
As in 352 ... 3+5-4=4
852... 8+5-2=11
794... 7+9-4=12
Then
9+5-1= 13
Solve it is very easy . ☺☺☺

Answer 2

Look at the digits carefully
354
3+5-4=4
852
8+5-2=11
794
7+9-4= 12
951
9+5-1=13