SOLUTION: Kathryn is 8 years older than her sister Rosemary. Eight years ago Kathryn was 3 times as old as Rosemary. How old is each now?

Question 981990: Kathryn is 8 years older than her sister Rosemary. Eight years ago Kathryn was 3 times as old as Rosemary. How old is each now?

Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
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R=Rosemary's age; K=Kathryn's age=R+8yrs
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K-8yrs=3(R-8yrs) Substitute for K
(R+8yrs)-8yrs=3(R-8yrs)
R=3R-24yrs
-2R=-24yrs
R=12 yrs ANSWER 1: Rosemary is 12 years old.
K=R+8yrs=12yrs+8yrs=20 yrs ANSWER 2: Kathryn is 20 years old.
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CHECK:
K-8yrs=3(R-8yrs)
20yrs-8yrs=3(12yrs-8yrs)
12yrs=3(4yrs)
12yrs=12yrs
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