The number of girls was 2/5 times more than the boys, which is 2/5*50 = <<2/5*50=20>>20 more girls.
The total number of girls on the trip is 50+20 = <<50+20=70>>70
Together with the driver, the assistant driver, and the teacher, there were 70+50+3 = <<70+50+3=123>>123 people on the bus
#### 123