Reasoning Ability

Professors ⊂ Knowledgeable. Some knowledgeable people are not teachers. Therefore, some of those non-teachers in the knowledgeable group could be professors. A must be true.

We know M, N (2 seats away clockwise), and K (opposite M). But without knowing other people's positions or exact starting point, the person between K and N cannot be uniquely determined.

Red at 3, Blue at 2. Green 2 right of Yellow: if Yellow at 1, Green at 3. But Red at 3. If Yellow at 4, Green at 6. This works: Blue(2), Red(3), Yellow(4), Green(6). Yellow at position 4... Rechecking: Yellow could be at 1 if Green at 3, but Red there. So Yellow at 4.

Order: A > C > D and A > B > E. Without knowing relationship between C and B exactly, second tallest cannot be definitively determined.

His mother's only child = the man himself. The man's mother = the woman's mother. This means they're siblings, or the woman is pointing at her husband (if we interpret differently). The answer is husband.

In a square table arrangement with 2 people per side: P and R on one side (R left of P), Q opposite P, S opposite R. Going clockwise from S to Q, there are 2 people between them.

South is called West in new terminology. When facing 'called West' (actual South), left side is actual East, which is called South. So answer is actual West.

Using circular arrangement logic: A's position is fixed. D is 2nd to left (clockwise from A's perspective). B is 3rd to right. E between C and F helps determine the remaining positions. C sits to immediate right of G.

Square table with 6 people (4 sides + 2 corners). D opposite B. C left of D. E at corner. A's position determined by elimination. A is opposite to E.

S at one end. Q between P and R (P-Q-R or R-Q-P). T not adjacent to Q. Only valid: S-T-P-Q-R or S-T-R-Q-P. T is adjacent to S.