2. 21 fives and 18 tens

3. 290 adults  and 210 students

4. 20 dimes and 7 quarters. 

5. 32 stamps at 33 cents each  and 8 stamps at 23 cents each 

6. 20 one dollar bills  and 6 five dollar bills 

7. 12 pounds of pecans and  8 pounds of macadamias 

8. 16 pounds of pecans  and 24 pounds of walnuts

9. $800 invested at 8%. and  $1600 invested at 11%. 

10. $6731 invested at 6%.

11. 34.67 hours at the $9 rate. 

12. 38 hours of work by the painter.