SOLUTION: The sum od Dylan's and Krista's ages is 25. In 12 years, Dylan will be seven years older than four times as old as Krista was five years ago. How old are Dylan and Krista now?

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Question 166050: The sum od Dylan's and Krista's ages is 25. In 12 years, Dylan will be seven years older than four times as old as Krista was five years ago. How old are Dylan and Krista now?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
call Dylan=d
: Krista=k

so d%2Bk=25 and d%2B12=4%28k-5%29%2B7
: d=25-k and d%2B12=4k-20%2B7 simplifying
: %2825-k%29%2B12=4k-13substituting d value in first equation into 2nd equation
: 37-k=4k-13 combining terms 5k=50 divide by 5 k=10
now d=25-k%2810%29=15