Five years ago, my age was half of the age I will be in 8 years. How old I am now?

• 
  let x be john's age now.
  five years ago, john's age was x-5
  eight years from now, john's age will be x+8
  -----
  Five years ago, John's age was half of the age he will be in 8 years.
  this means that (x-5) = (x+8)/2
  -----
  solving for x, we get:
  2 * (x-5) = x + 8
  
  which becomes:
  2x - 10 = x + 8
  which becomes:
  x = 18
  -----
  john is 18 years old now.
  5 years ago john was 13
  8 years from now john will be 26
  13 = 1/2 * 26
• 9 years agoHelpfull: Yes(0) No(0)