Problema Solution
Erica's uncle is three times older. Four years ago Erica's uncle was four times older. How old is Erica?
Answer provided by our tutors
Let
x = the present age of Erica, x>0
3x = the present age of Erica's uncle (Erica's uncle is three times older)
Four years ago Erica's uncle was four times older:
3x - 4 = 4(x - 4)
........
........
x = 12 years
Erica is 12 years old.