In a class exactly 10% students get 70 marks, exactly 25% get 80 marks, exactly 15% get 85 marks, exactly 25% get 90 marks and remaining get 95 marks.what is the minimum number of students in the class if the avg. of sum of marks is an even no.

option A)20 B)80 C)100 D)200

• A)20
  10% of 20=2, 2*70=140
  25% of 20=5, 5*80=400
  15%of 20=3, 3*85=255
  25% 0f 20=5, 5*90=450
  remaining students= (20-(2+5+3+5))=5
  5*95=475
  avg.= 140+400+255+450+475=1720/20 =86
  
  reply if i m wrong
• 8 years agoHelpfull: Yes(10) No(4)
• Let total no. of students be x
  (x(10*70 + 25*80 + 15*85 + 25* 90 + 25*90)/100)/ x = 86
  Hence the avg is always 86 and does not depend upon the no. of students.
  Hence the answer is the minimum value that is 20
• 8 years agoHelpfull: Yes(8) No(4)
• Minimum num of students is 20
• 8 years agoHelpfull: Yes(2) No(0)
• @vikash kumar aate nehi toh galat solution kyu dete ho BC?
• 7 years agoHelpfull: Yes(2) No(1)
• correct answer is 80
  suppose total student in a class is 100
  so 10 percent of 100=10
  so toatal marks =10*70=700
  now 25 percent of 90=22.5
  total=22.5*80=1800
  calculate this way and take the avg u got the answer
  
• 8 years agoHelpfull: Yes(1) No(4)
• how r u calculating 86!!!!!!!!!!!!!????
• 7 years agoHelpfull: Yes(1) No(0)
• same goes for 80
• 8 years agoHelpfull: Yes(0) No(0)
• Why we take the minimum value @sajal
• 8 years agoHelpfull: Yes(0) No(0)
• how is everyone getting average as 86 while it is 84.75 ????
• 6 years agoHelpfull: Yes(0) No(0)