Is it possible to loose 30-40lbs on 900 calories count i am 31 years old 411 165lbs i want to loose 40 in month on 600 calorie count.?

It's not healthy to lose 40 pounds in a month. You should only be losing around 8 pounds a month. The faster you lose weight, the faster you'll gain it back. Do not lower your calorie count below 1200 because your body will not work properly. You're crazy for even mentioning a 600 calorie count, because you will not get any nutrition and will be very hungry and tired.