Number Guess

Ahmad Tahir

Here i attached mobile application Link
https://play.google.com/store/apps/details?id=com.appshorizon.agefinder
I want to know the logic of this application

1:- It have four screens and every screen have numbers.
2:-Application asked on every screen "Do you Know your age is here in these numbers".
3:-If i see the number is on the screen then i pressed "Yes" otherwise press "NO".
4:-This procedure repeat 4 times and application fined out the number or age that is in my mind.

Help me the Logic of this Application using Math.