Solving maths problems

This task is about solving maths problems.

illustration: two cows

a)
There are 21 people at a beach, and 13 more people arrive. 
Show how to work out how many people are at the beach altogether.
 
 
 
 
 
  
 
Answer: __________  

 

b)
Two classes go on camp together. One class has 37 students and the other has 28. 
Show how to work out how many students go on camp.
 
 
 
   
 
 
  
 
Answer: __________  

 

c)
A farmer has 63 cows.  He buys 59 more cows. 
Show how to work out how many cows he has altogether.
 
 
 
 
 
    
 
 
Answer: __________