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

• 9 candidates failed in the exam.
  
  Total Number of Students:
  12 students before Mr.X followed by 16 students.
  That means, In total (12+16+Mr.X) = 28+1 = 29 students.
  
  Passed Number of Students :
  7 students before X followed by 12 students.
  In total (7+12+ Mr X) = 19 +1 = 20 students.
  
  Candidates failed in exam : Total - Passed Candidates
  = 29 -20
  = 9 candidates failed in exam
• 12 years agoHelpfull: Yes(70) No(2)
• Consider Mr x roll no is 13 from 1st and 17th from last , i.e 13+17(becoz there are 17 students afta him)=30 students in all total.
  
  again, among the passed candidates: 8th from 1st nd 13th from last,
  therefore, 8+13(because there are 13 students afta him in the pass list)=21
  
  students failed=30-21=9
  ans: 9 students
• 10 years agoHelpfull: Yes(4) No(1)
• total no.of candidate=29.
  Passed Candidate=20.
  Failed candidate=(29-20)=9
  
• 10 years agoHelpfull: Yes(3) No(0)
• -->13
  1713+16=29 tot stud
  -->8
  138+12=20 passed
  29-20=9failed
• 10 years agoHelpfull: Yes(1) No(0)
• consider the ranks of passed student i.e from 1st is 8 and from last is 13
  so the difference in ranks of pass student from first is 13-8=5
  and from last same as above 17-13=4
  so total student who passed 5+4=9;
• 10 years agoHelpfull: Yes(0) No(0)
• 17+12=29(total student)
  8+12=20(passed student)
  
  29-20=9 (fail student)
• 10 years agoHelpfull: Yes(0) No(0)
• Amswer is 8
• 8 years agoHelpfull: Yes(0) No(1)