The average weight of 8 men is increased by 1.5 kg when one of the men who weighs 65 kg is replaced by a new man. The weight of the new man is :

a. 76 kg
b. 76.5 kg
c. 76.7 kg
d. 77 kg

• ans is : 77 kg
  average weight of 8 men is increased by 1.5 that is 1.5*8=12kg
  by adding this 12kg with replaced man weight then we get new man weight=12+65=77
• 9 years agoHelpfull: Yes(7) No(0)
• Solution: Let x be the average weight of 8 men (before replacement). Therefore (x+1.5) will be the average weight of 8 men (after replacement)
  
  (7*x + 68)/8 = x; x=65
  
  (7*x + new)/8 = x+1.5
  
  New = (8*65+8*1.5 – 8*65) = 65+12 = 77
• 10 years agoHelpfull: Yes(1) No(1)
• weight of 7mens=x new men weight =z
  x+65/8=y
  x+z/8=y+1.5
  solve this eqation we get 77
• 7 years agoHelpfull: Yes(1) No(0)
• Short cut:
  65+1.5*8
  =65+12
  =77
• 7 years agoHelpfull: Yes(0) No(0)
• let us take one man weight = 65
  avg of 8 members is increased by 1.5 means => each person in the group is also increased by 1.5
  so 65+(8*1.5) = 77
• 6 years agoHelpfull: Yes(0) No(0)
• option d is correct ans
  avg weight of 8 men are increased by 1.5 means=8*1.5=12
  then one men weight is 65 its added to the above means
  i.e., 12+65=77
• 6 years agoHelpfull: Yes(0) No(0)
• Total weight increased = (8 x 1.5) kg = 12 kg.
  
  Weight of new person = (65 + 12) kg = 77 kg.
  
  Ans = 77
• 5 years agoHelpfull: Yes(0) No(1)