Posted by Vince on Thursday, May 27, 2010 at 11:12am.
A mother is 21 years older than her new born daughter. How old will the daughter be when her age is 1/4 of her mother's?

Math  PsyDAG, Thursday, May 27, 2010 at 11:21am
Let x = daughter's age and x + 21 = mother's age.
x = 1/4(x + 21)
Solve for x.