SOLUTION: grace is 8 years older than her brother sam. the sum of their ages is 20. how old is sam?

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Question 1149310: grace is 8 years older than her brother sam. the sum of their ages is 20. how old is sam?
Answer by Alan3354(69443) About Me  (Show Source):
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grace is 8 years older than her brother sam. the sum of their ages is 20. how old is sam?
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G - S = 8
G + S = 20
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