Hi,

Today Mary's father is 12 years older than twice Mary's age

Mary's age: 

father's age: 

Question states***Three years ago Mary was three times as young as her father.

(father was 3 times as old)

 2x + 12 - 3 = 3(x-3)

 2x + 9 = 3x - 9

      18 = x, Mary's age NOW



and***father NOW 48...Three years ago

  

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