I took a simple one screen approach with my app. At the top I have a text box to enter your age (I made sure that a number was entered). Then I added two dropdowns or "spinners" that allow you to select what animal you are, and what animal's age you want to know. Lastly, I added a submit button that on press shows you your output age.
The Link to the video is: https://vimeo.com/138837113
my Bitbucket repo: https://bitbucket.org/pressjeremy/hw-prog-submissions-jeremy-press
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