2 similar tiny and simple iPhone apps

It's 2 very simple iPhone (Android as well, it would be nice) apps based on this logic : Ask to the user of the app to enter two parameter (2 numbers). Adding them to each other it gives a result. If the result if even, then show picture A. If the result is odd, then show Picture B. That's it. That is the mechanism. Now, I you to code a second app where we inverse the logic... so we ask the user to start by the end (choose a picture) and the app will tell him which parameters (those 2 numebrs) he has to get. ## Deliverables Everything is included in the .zip archive where 2 four-slide pdf files explain everything.