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Five years ago a father was three times as old as his son. Ten years from now he will be twice as old as his son. The father's present age is:

Competition practiceAlgebra
  • A40 years
  • B45 years
  • C55 years
  • D50 years

Step-by-Step Solution

Let the ages now be and . Then gives , and gives . So and . Check: and .
Answer: D) 50 years

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