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x - father's age

y - son's age

  • x=9y
  • x+5=4(y+5)

=> 9y+5=4y+20 => 5y=15 => y=3

x=9y => x=27

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Q: How do you solve this A father is 9 times the age of his son In 5 years he will be 4 times the age of his son How old are they now?
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