Hi

Jill's mum was 24 when Jill was born

Let x and (x+24) represent Jill and her mother's ages

Question states***

 (x+24) = 3x

Solving for x

    24 = 2x

     x = 12, Jill's age.  Her mother is 36.  (12+24)



CHECKING our Answer***

  36 = 3*12 

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