Math
posted by mjLa .
A mother is 4 times as old as her daughter. In 4 years, the mother will be 3 times as old as her daughter. How many years old is the daughter now?
I came up with two equations:
M = 4D and M + 4 = 3(4 + D)
and I got D to be 12 but that isn't the correct answer??

M = 4D and M + 4 = 3(4 + D)
4 D + 4 = 12 + 3 D
1 D = 12  4
D = 8