Is it enough to lose half a stone in 25 days?

I am eating healthy and often, have cut out fizzy drinks and only drink water and green tea now and I am doing 30 min of cardio a night-not including warm up, wind down, (fitness video- either pump it up, or billy blanks cardio, badminton, swimming, ( lol) do you think it would be possible to lose half a stone in 25 days? I am 5"10 and nine and a half stone and have gained that half stone through having a bad year and eating junk and not looking after my self.