You can't. That's too much weight to lose that quickly, in a safe manner.
you can try the Optifast program. Its designed for people who need to lose weight before surgery. My mum lost 15kg in 3 weeks and I lost 10kg in 3 weeks. it's very strict but if you can commit to it, it works.
These types of weight loss are not recommended, because they lose weight too quickly, and are most likely losing water and muscle, not fat. Nearly all lost weight is regained as soon as the plan is stopped...