How many people were on the train to begin with?

Question

There were some people on a train.
19 people get off the train at the first stop.
17 people get on the train.
Now there are 63 people on the train.
How many people were on the train to begin with?

Answer 1

65 people were on the train to begin with.

Answer 2

Let's initially x people on the train
After first stop,
19 get down =-19
17 get up =+17
=>(x-19+17)=63
=>x=65
Ans is 65

Answer 3

Let X be the number of people that were originally on the train, Then
X - 19 + 17 = 63
X = 65