When three friends A, B and C met, it was found that each of them wore an outer garment of a different colour. In random order, the garments are: jacket, sweater and tie; and the colours are: blue, white and black. Their surnames in random order Kumar and Singh. Further, we know that: 1. neither B nor Ribeiro wore a white sweater 2. C wore a tie 3. Singh's garment was not white 4. Kumar does not wear a jacket 5. Ribeiro does not like to wear the black colour 6. Each of the friends wore only one outer garment of only one colour Who wore the sweater?

Here's a step-by-step deduction:

1. C wore a tie. (Statement 2) This immediately tells us that C is not the person who wore the sweater or the jacket.

2. Analyze "Neither B nor Ribeiro wore a white sweater." (Statement 1) In logic puzzles of this type, a phrase like "X did not wear a Y Z" can sometimes be interpreted as "X did not wear a Y (of any color)". If we interpret this statement as "B did not wear a sweater" and "Ribeiro did not wear a sweater":

   • Since C wore a tie, and B did not wear a sweater, the only remaining garment for B is the jacket. So, B wore a jacket.
   • With C wearing a tie and B wearing a jacket, the only remaining garment for A is the sweater. Therefore, A wore the sweater.

3. Verify the interpretation for Ribeiro:

   • We deduced that A wore the sweater. If Ribeiro did not wear a sweater (as per our interpretation of statement 1), then A cannot be Ribeiro.
   • This means Ribeiro must be either B or C.
   • If Ribeiro is B, B wore a jacket, which is consistent with "Ribeiro did not wear a sweater".
   • If Ribeiro is C, C wore a tie, which is consistent with "Ribeiro did not wear a sweater".
   • Since this interpretation is consistent with the rest of the puzzle and leads to a unique answer, it is the intended interpretation.

Therefore, A wore the sweater.

The final answer is A