This is probably the longest problem I've ever had. #12. Check my work, please. I'm a bit leery of the solution to the salt content, y(t), for Tank B simply because it seems quite complicated. The first part wasn't too bad, though.
http://i111.photobucket.com/albums/n149 ... /2512a.jpg
http://i111.photobucket.com/albums/n149 ... 8/2512.jpg
http://i111.photobucket.com/albums/n149 ... /2512a.jpg
http://i111.photobucket.com/albums/n149 ... 8/2512.jpg