पांच लोग, A, B, C, D, और E, उत्तर की ओर उन्मुख होकर एक पंक्ति में बैठे हैं। A पंक्ति के दाएं छोर से चौथे स्थान पर बैठा है। B और D के बीच केवल एक व्यक्ति बैठा है। D, A का निकटतम पड़ोसी नहीं है। A और D के बीच कितने लोग बैठे हैं?

Seven people, C, D, E, F, W, X and Y, are sitting around a circular table facing the centre. Only two people sit between C and D when counted from the left of D. X sits to the immediate right of D. Only three people sit between D and E. F sits to the immediate right of W. How many people sit between Y and F when counted from the right of F?

Five students (A, B, C, D, and E) are standing in a line during a school assembly. C is standing exactly behind D. E is not standing behind B. A is standing ahead of C but not ahead of B. If 'behind' means being exactly next to someone's back and 'ahead' means anywhere in front of someone, who among the five students is standing at the third position from the front?