the average marks obtained by 120 candidates in a certain examination is 35. if the average amrks of passed candidates is 39 and that of the failed candidate is 15. the number of candidates who passed the examination....

• 100
  
  Let the number of passed candidates be x and failed candidates be y, then
  x+y= 120 ---(i) and
  Average marks of 120 candidates = (39x + 15y)/120 = 35 or 13x + 5y = 1400 ---(ii)
  On solving (i) & (ii), x=100, y=20
• 7 years agoHelpfull: Yes(0) No(0)
• ratio of passed to failed student = 35-15 : 39-35= 20:4=5:1
  number of student passed=120x5/6=100
• 6 years agoHelpfull: Yes(0) No(0)