Question 1130820
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Let x be the Lyn's age.

Then the father's age is 4x.


Five years ago Lyn was (x-5) years old, while her father was (4x-5) years old.


The condition says

4x-5 = 7(x-5).


Simplify and solve


4x - 5 = 7x - 35

35 - 5 = 7x - 4x

30 = 3x

x = 30/3 = 10.


<U>Answer</U>.  Lyn is 10 years old now.
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Solved.