The students at a school in Delhi were asked what modes of transportation they had used to travel to school in the past week. 46% had caught a bus, 37% had caught a train, and 31% had been driven in a car. 13% had caught a bus and a train, 5% had caught a bus and been driven in a car, and 9% had caught a train and been driven in a car. 11% of students used none of these modes of transport.
Find the percentage of students who used all three modes of transport.