Three years ago the average of A and B was 18 Years. With C joining them now, the average becomes 22 years. How old is C now?

a) 24 years b) 27 years c) 28 years d) 30 years

• (a+b)/2=18
  (a+3+b+3+c)/3=22
  (3+3+36+c)/3=22
  c=24
• 12 years agoHelpfull: Yes(15) No(7)
• Option A 24 years
  
  
• 12 years agoHelpfull: Yes(5) No(4)
• let me explain...
  let,present age of A and B is x and y.
  before 3 yrs ago sum of their age was (x-3)+(y-3)=2*18
  x+y=42..........(1) and
  now sum of their age is x+y+z=22*3 (let c's present age is z)
  x+y+z=66..........(2)
  solving eqn (1) and (2), we get z=24
• 10 years agoHelpfull: Yes(1) No(0)
• i will tell in a shortcut way
  3 yrs back a+b=36
  now, 36+6+c=22*3, simplify c is 24.
• 10 years agoHelpfull: Yes(1) No(1)