Three years ago the average age of A and B was 18 years. While C joining them now, the average becomes 22 years. How old (in years) is C now?
(1) 24
(2) 27
(3) 28
(4) 30

• ans: 24
  a+b= 36 it is 3 years before but now their total age = 36+3+3 = 42
  42+c= 66; c= 24
• 9 years agoHelpfull: Yes(2) No(0)
• (a-3)+(b-3)/2=18
  a+b=30
  a+b+c/3=22
  a+b+c=66
  c=66-30
  c=36
• 10 years agoHelpfull: Yes(1) No(0)