1. Make 40 with 3 coins.

 

 

 

 

 

 

 

2. Make 40 with 4 coins.

 

 

 

 

 

 

 

3. Make 30 with 4 coins.

 

 

 

 

 

 

 

4. Make 50 with 5 coins.

 

 

 

 

 

 

 

5. Make 50 with 6 coins.

 

 

 

 

 

 

6. Make 20 with 7 coins.