King JoFe of Wakanda is making a donation of vehicles to the University Security Team to help them police and secure campus at all times. The donation consists of Segways and Golf-carts. Each Segway will cost $3000 and each golf-cart will cost $2000. King JoFe will donate $51,000 and the University is prepared to accept 30 vehicles. How many Segways will be donated if the entire donation is spent and the University receives 30 vehicles?