Q. A father F has 5 sons, p, q, r, s, t. Not necessarily in this order. Two are of same age. The eldest and youngest cannot be twins. T is elder to r and younger to q and s has three older brothers.
q) who are the twins?
q) who is the oldest and youngest?

• Twins are P and T
  oldest = Q ; Youngest = R;
  
  After solving the qn. we get in the order from elder to youngest is,
  
  Q P T S R (OR) Q T P S R
• 12 years agoHelpfull: Yes(4) No(1)
• p..q..r..s..t
  q > t > r > s
  ans>>> s and p are twins..
  ans>>> q is oldest and a and p are youngest
• 10 years agoHelpfull: Yes(2) No(0)
• p and s are twins..
  q is eldest
  p and s are youngest.
  
• 9 years agoHelpfull: Yes(1) No(1)
• twins=r,s
  oldest=p
  youngest=r
• 10 years agoHelpfull: Yes(0) No(2)
• s=p
• 9 years agoHelpfull: Yes(0) No(0)
• Use T is elder to R and younger to Q. -; R < T < Q
  Use Eldest and youngest cannot be twins and S has three older brothers.
  R
• 9 years agoHelpfull: Yes(0) No(0)
• r and s are of same age .
  
  and p is the eldest one.
  
  arrangement made in order of increasing age from left to right is
  
  srtqp
  
  or
  
  rstqp
• 8 years agoHelpfull: Yes(0) No(1)