Today a father's age is five times his son's age. Exactly three years ago, the sum of their ages was 30. How old is the son today?
Question:
Today a father's age is five times his son's age. Exactly three years ago, the sum of their ages was 30. How old is the son today?
Answer:
Let's think step by step.

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Today a father's age is five times his son's age. Exactly three years ago, the sum of their ages was 30. How old is the son today?
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