There are 19 triangles in the figure.
ANSWER #2:
There are 20 triangles in the figure.
ANSWER #3:
There are 17 triangles in the figure.
ANSWER #4:
There are 21 squares in the figure.
ANSWER #5:
A. The 3rd column is derived by adding together the first and second columns, but leaving out any items which are common to both columns.
ANSWER #6:
Only D & E will form a knot.
ANSWER #7:
He puts the handkerchief under a door and stands on the corner at the other side.
ANSWER #8:
| 17 | 14 | 6 | 3 | 25 |
| 1 | 23 | 20 | 12 | 9 |
| 15 | 7 | 4 | 21 | 18 |
| 24 | 16 | 13 | 10 | 2 |
| 8 | 5 | 22 | 19 | 11 |
| 12 | -1 | -2 | 9 |
| 1 | 6 | 7 | 4 |
| 5 | 2 | 3 | 8 |
| 0 | 11 | 10 | -3 |
| 8 | -7 | -6 | 5 |
| -4 | 3 | 2 | -1 |
| 1 | -2 | -3 | 4 |
| -5 | 6 | 7 | -8 |
| 7 | 0 | 5 |
| 2 | 4 | 6 |
| 3 | 8 | 1 |
48 x 4 = 192 / 3 = 64
27 x 4 = 108 / 3 = 36
57 x 4 = 228 / 3 = 76
ANSWER #13:
289. The list comprises square numbers where each digit is greater than the previous digit.
ANSWER #14:
8. The sequence is: 1, 2, 4, 8, 16, 32, 64, 128
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