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ATQ,
Let the present age of the daughter and the mother be 'x' years and '3x' years, respectively.
Then, present age of the father = (3x + 3) years
So, x + 3x + (3x + 3) = 84
Or, 7x + 3 = 84
So, x = (84 - 3) ÷ 7 = 11
Present ages of the daughter and father are 11 years and 36 years, respectively.
For some 'y',
(11 + y) × 2 = (36 + y)
Or, 22 + 2y = 36 + y
So, y = 14
14 years hence from now, the father will be twice as old as the daughter.
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