(1-3): In a group of 75 students, each has at least one vehicle, except 10 students who have none of the three vehicles. There are 45 students who have a car, 35 have a scooter and 25 have a bike. Also, it is known that 11 students have both cars and bikes, 12 have both bikes and scooters, and 12 have both cars and scooters.
Q. How many students have only cars?