Question 437303
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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