Question 984438
Hi there,
A father is three times his daughter's age.
F = 3D
In 10 years time the sum of their ages will be 68. 
F + 10 + D + 10 = 68
Replace F with 3D
3D + 10 + D + 10 = 68
Collect like terms
3D + D = 68 - 10 - 10
4D = 48
D = 12
Daughter = 12yrs old
Father = 36yrs old
Hope this helps you :-)