Math
posted by Heleny .
At present a woman is twice as old as her daughhter, twenty one years ago she was 3 times older than her daughter
Hint: ket x be the daughters current age

First we represent the unknowns:
Let x = daughter's present age
Let 2x = mother's present age
According to the problem, 20 years ago, the mother was three times older than her daughter. Thus,
2x  20 = 3(x  20)
Solving for x,
2x  20 = 3x  60
2x  3x = 60 + 20
x = 40
x = 40 years old (daughter, present age)
2x = 80 years old (mother, present age)
hope this helps~ :) 
thankss alot :D

Actually it was 21 years ago...

But i get it thanks :)