Each of the top three rows of numbers demonstrates the same
arithmetical pattern. Discover what the pattern is. Then
determine what number should be substituted for the question mark.
| 7 | 4 | 8 |
| 3 | 9 | 7 |
| 6 | 5 | 10 |
| ? | 8 | 4 |
Solution:
The answer is 3.
| 7 | x | 4 | - | 8 | = 20 |
| 3 | x | 9 | - | 7 | = 20 |
| 6 | x | 5 | - | 10 | = 20 |
| 3 | x | 8 | - | 4 | = 20 |
Thanks to everyone who sent in a solution to this week's problem.
It was nice to see such a large contingent from Brookstone School
in Columbus, Georgia!
Correctly solved by:
| 1. Richard K. Johnson | La Jolla, California |
| 2. Bob Hearn | Winchester, Virginia |
| 3. Diana Xing | Fort Collins, Colorado |
| 4. Walt Arrison | Philadelphia, Pennsylvania |
| 5. Tony Wu | Fort Collins, Colorado |
| 6. Janine Oliver | Winchester, Virginia |
| 7. George Gaither | Winchester, Virginia |
| 8. Izzy Kushner | Closter, New Jersey |
| 9. Kirstine Wynn | Winchester, Virginia |
| 10. Renata Sommerville | Austin, Texas |
| 11. Tori Eads | Winchester, Virginia |
| 12. John Beasley | Winchester, Virginia |
| 13. Jeffrey Ward | Columbus, Georgia |
| 14. Wilds Ogie | Columbus, Georgia |
| 15. Sarah Jarrell | Columbus, Georgia |
| 16. M. Ramsey | ---- |
| 17. Jessica Pfeiffer | ---- |
| 18. Laura | ---- |
| 19. Carter Staples | Columbus, Georgia |
| 20. Daniel Parker | Columbus, Georgia |
| 21. Harrison Wallace | Columbus, Georgia |
| 22. Danny P | ---- |
| 23. Clare Flournoy | Columbus, Georgia |
| 24. Ashleigh Mark | Columbus, Georgia |
| 25. Ashley Maignan | Columbus, Georgia |
| 26. Keith Mealy | Cincinnati, Ohio |
| 27. Sanders Griffith | ---- |