<PRE><B>Question 772694</B>
Mrs. De Leon is three times as old as her daughter.
MDL = 3D
In 12 years she will be only twice as old.
MDL + 12 = 2(D + 12)
Replace MDL with 3D from first equation.
3D + 12 + 2(D + 12)
3D + 12 = 2D + 24
Collect like terms
3D - 2D = 24 - 12
D = 12
Present ages.
Daughter - 12yrs old
MDL - 36yrs old.
Hope this helps.
:-)</PRE>