what should be the minimum no of student in a class room in which 25% student score 75 marks,10% student score 85 marks,15 % student score less than 50 marks, 25% score 60 marks and remaining student score more than 90 marks..
option:
A-100
B-80
C-70
D-None of these

• 75 MARKS------------------------------->25%
  80 MARKS------------------------------->10%
  50 MARKS(LESS THAN)-------------->15%
  60 MARKS------------------------------->25%
  90 MARKS(REMAINING)------------>25%
  
  RATIO=(25x:10x:15x:25x:25x)=(5x:2x:3x:5x:5x)
  
  ADDING ALL WE GET 20x (PUT x=1)(FOR MINIMUM NO. OF STUDENTS)
  =20 ANS
  THEREFORE D)NONE OF THESE
• 9 years agoHelpfull: Yes(17) No(2)
• 90 marks =>100-(25+10+15+25) =100-75 =25
  => H.C.F of 25,10,15,25,25 is 5
  => dividing every % of students Categery with H.C.F,
  => Total Students= 5+2+3+5+5= 20
• 9 years agoHelpfull: Yes(11) No(0)
• 75 MARKS------------------------------->25%
  80 MARKS------------------------------->10%
  50 MARKS(LESS THAN)-------------->15%
  60 MARKS------------------------------->25%
  90 MARKS(REMAINING)------------>25%
  
  No of student who score marks(355)=(25x+10x+15x+25x+25x)
  
  ADDING ALL WE GET 20x (PUT x=1)(FOR MINIMUM NO. OF STUDENTS)
  100
• 9 years agoHelpfull: Yes(4) No(0)
• 20 i.e lcm of 4, 10 and 20
• 9 years agoHelpfull: Yes(2) No(4)