1. 15
   

   
   

2. 22, 23
   

   
   

3. 7, 8

   
   

4. 10
   
   

5. 12, 14
   

   
   

6. 102
   

   
   

7. 21
   
   

8. 498

9. Not possible!
   
   

10. 51

Solve all problems before looking at the answers.