If In go to the gym for 1 hr, 5 days a week for a year how much weight do you think i'll lose?

I have takeaway about once a fortnight and have a fairly balanced diet. I'm aiming to lose about 50 pounds (4 stone/22kg) . Do you think this is realistic? By how much do you think my fitness will go up when I do the bleep test 3 months into training?