Buses, games and trains

This task is about solving some addition and subtraction problems.
illustration: bus  
a)
A bus has 67 passengers. It drops off 39 people. 
Show how to work out how many people are still on the bus.
 
 
 
 
 
 
 

Answer: _____   
  
b)
  
Pere has 127 computer games.  He gives away 35 of his old games. 
Show how to work out how many computer games he still has.
 
 
 
 
  
 
 

Answer: _____   
 
c)
 
A train has 264 people.  92 people get off at a station. 
Show how to work out how many people stay on the train.
 
 
 
 
 
 
 

Answer: _____