Hi

a father is now twice as old as his daughter

Let x and 2x represent the daughter's and father's ages NOW reszpectively

Question states*** 10 years ago...

 2x-10  = 3(x-10)

Solving for x

    20 = x, daughters age now.  Father is 40.



CHECKING our Answer***10 years ago...

   30 = 3*10 

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