The average of the ages of Sumit, Krishna and Rishabh is 43 years and the average of the ages of Sumit, Rishabh and Rohit is 49 years. If Rohit is 54 years old, what is Krishna'a age?
A) 45 years
B) 24 years
C) 36 years
D) Cannot be determined
E) None of these

• C) 36 Years
  
  Let present ages of Sumit=w, Krishna=x, Rishabh=y and Rohit=z , then
  w+x+y=43*3=129 ---(i) and
  w+y+z=49*3=147 ---(ii)
  Subtracting (i) from (ii), (w+y+z) - (w+x+y)=147 -129 , z- x =18 ---(iii)
  Given Rohit's age=z=54, so from (iii), x=54-18= 36
  
• 8 years agoHelpfull: Yes(6) No(0)
• Sumit +Krishna + Rishabh=43*3
  Sumit + Rishabh + Rohit=49*3
  93 + Krishna=129
  krishna=36
• 7 years agoHelpfull: Yes(0) No(0)