SOLUTION: Julia is 9 years older than Tina. 7 years ago Julia was twice as old as Tina. How old is Tina now?

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Question 1008573: Julia is 9 years older than Tina. 7 years ago Julia was twice as old as Tina.
How old is Tina now?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Call Julia's and Tina's age NOW, j and t. Then we have
j = t + 9 and seven years ago
j - 7 = 2(t - 7)
Substituting we get
t + 9 - 7 = 2(t - 7)
t + 2 = 2t - 14
Rearranging we get
t = 16 years
j = 25