the average age of 8 students increases by 2.5kg.when a new person comes to the place 65kg student .then what is the average of new students?

• otal weight increased = (8 x 2.5) kg = 20 kg.
  
  Weight of new person = (65 + 20) kg = 85 kg.
• 10 years agoHelpfull: Yes(13) No(0)
• ans is==42.5
  
  assume that the avg of 8 students is =x
  thus the sum of 8 students=8x
  
  (8x+65)/9=x+2.5
  
  solving the equation x= 42.5
• 10 years agoHelpfull: Yes(12) No(7)
• New Avg= 45+2.5
  
  (x1+x2+x3+x4+x5+x6+x7)/7 = Avg------1
  
  ((x1+x2+-------+x7)+65)/8 = Avg + 2.5 -------2
  
  Sub 1 in 2 we get
  
  (7(Avg)+65)/8 = Avg+2.5
  8Avg+20=7avg+65
  Avg=45
  
  Average = 45
• 10 years agoHelpfull: Yes(6) No(5)
• (x1+...+x7+65)/8=y
  now
  (x1+....+x7+new stu)/8=y+2.5
  afer calculating both equn
  we get new stu=85
• 10 years agoHelpfull: Yes(4) No(1)
• please read the question clearly....new person is placed in the place of 65kg student....i.e 65kg std is replaced by the new person
• 10 years agoHelpfull: Yes(2) No(0)
• weight is overall increased by (2.5X8= 20 kg)
  new weight is 85kg
  average= 85/8=10.625
• 10 years agoHelpfull: Yes(2) No(1)
• The question written by you is so wrong. It will be:
  The average weight of 8 persons increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?
  a. 76 kg
  b.76.5 kg
  c. 85 kg
  d.data inadequate
  e.none of these
• 9 years agoHelpfull: Yes(2) No(0)
• dummy question i think
• 10 years agoHelpfull: Yes(1) No(1)
• Question should be:
  the average age of 8 students is increased by 2.5kg when a new person comes to the place 65kg student .then what is age of new students?
  sol- Total age increased=(2.5*8)=20
  so, the age of new student=65+20=85
  
  
• 10 years agoHelpfull: Yes(1) No(1)