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Five years ago, a man's age was 7 times his son's age. At present, the man's age is 4 times his son's age. What is the son's present age (in years)?

Competition practiceAverages & Ages
  • A10
  • B8
  • C12
  • D15

Step-by-Step Solution

Let the son be s and the man 4s. Then 4s - 5 = 7(s - 5) gives 4s - 5 = 7s - 35, so 3s = 30 and s = 10 years.
Answer: A) 10

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