Mr X position in a class is 13th from first and 17th from last, and 8th from the first and 13th from last in passed candidates list, then how many candidates failed in the exam

• Originally, there are 12 students ahead of X and 16 students behind him. Therefore, the total number of students are = 12 + 16 + 1 = 29 (including X himself).
  
  After the exam, there are 7 students ahead of X and 12 students behind him in the passed list. Therefore, total number of students who passed = 7 + 12 + 1 = 20.
  
  Therefore, the number of students who failed = 9 (ans)
• 12 years agoHelpfull: Yes(44) No(2)
• Total candidates = 13+17-1= 29
  Total pass candidates = 8+13-1=20
  
  so total failed candidates = 29-20=9
• 12 years agoHelpfull: Yes(18) No(2)
• I think statement should be
  8th from the last and 13th from first in passed candidates list,
  
  In any case,
  
  
  Total candidates = 13+17-1= 29
  Total pass candidates = 8+13-1=20
  
  so total failed candidates = 30-20=10
• 12 years agoHelpfull: Yes(4) No(18)
• total student is ====29
  pass student ===20
  so student fail ===9
• 12 years agoHelpfull: Yes(2) No(4)