Since Tina is 4 yesrs younger than than Jeff, if Jeff is 15, Tina is 4 years younger than 15, or 11. Since Tina is 4 yesrs younger than than Jeff, if Jeff is 20, Tina is 4 years younger that 20, or 16. Since Tina is 4 yesrs younger than than Jeff, if Jeff is 58, Tina is 4 years younger than 58 or 54. Pretty easy, huh? Edwin