Question 10
What number should replace “?” in the following diagram?
| Triangle | Top | Lower left | Lower right | Center |
|---|---|---|---|---|
| 1 | 3 | 1 | 2 | 12 |
| 2 | 10 | 12 | 5 | 54 |
| 3 | 10 | 4 | ? | 36 |
Use the simple intended rule: the center number is twice the sum of the three outside numbers.
| Triangle | Top | Lower left | Lower right | Center |
|---|---|---|---|---|
| 1 | 3 | 1 | 2 | 12 |
| 2 | 10 | 12 | 5 | 54 |
| 3 | 10 | 4 | ? | 36 |
Use the simple intended rule: the center number is twice the sum of the three outside numbers.