SOLUTION: Mary is 6 years older than her sister kelly. The sum of their ages is 48. How old is kelly?

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Question 1132395: Mary is 6 years older than her sister kelly. The sum of their ages is 48. How old is kelly?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
k+6 and k, their ages

%28k%2B6%29%2Bk=48
.
.
k=21, Kelly's age