SOLUTION: Catya's age is half the sum of her brother's age and 6. If catya's is 9 years old, how old is her brother?

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Question 1045579: Catya's age is half the sum of her brother's age and 6. If catya's is 9 years old, how old is her brother?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = her brother's age
+9+=+%28+x+%2B+6+%29%2F2+
+18+=+x+%2B+6+
+x+=+12+
Her brother is 12