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I am F years old and my brother is B years older.What is the sum of our ages?

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If you are F years old and your brother is B years older, then your brother is F+B years old. Add your age (F) and your brother's age (F+B) and you get F+(F+B) = 2F+B

The sum of your ages is 2F+B

where F and B are placeholders for numbers.

User Macbeth
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