What's my number?

This task is about problem solving a number puzzle.
collection of numbers
 
What is the unknown number in each of these puzzles? There is working space for you to use if you need it.
 
a) Puzzle 1  

If you take my number, multiply it by 3, then add 7, the total will be 52.

 

 

 

 

What is my number? __________
 
b)		  
Puzzle 2  

If you take my number, subtract 10, then divide it by 2, the total will be 16.

 

 
 

 

What is my number? __________
 
c)		  
Puzzle 3  

Five is added to my number and the answer is halved. The total is 11.

 

 
 

 

What is my number? __________