SOLUTION: katie is twice the age of sophie this year. Four years ago she was three times Sophie's age, what is Sophie's age now

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Question 1080722: katie is twice the age of sophie this year. Four years ago she was three times Sophie's age, what is Sophie's age now
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.K=2S
Four years ago,
K-4=3%28S-4%29
K-4=3S-12
K=3S-8
Substituting from 1,
2S=3S-8
-S=-8
S=8