Answer: 65
Step-by-step explanation:
Let's work backwards. Start with 63.
17 people get on. This would be represented as +17, but because we're going backwards, it would be the opposite, -17. Subtract: 63-17. We get 46.
19 people first get off. Again, this would be represented as -19, but the opposite of that would be +19.
Finally, do 46+19 to get 65 Hope this helps! :)