Question 1088814
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1.  First step is to find the total age of all members of the family.

    It is 30*8 = 240 years.


2.  Second step is to find the total age of all children.

    It is 6*9 = 54.


3.  Now yo can calculate the total age of parents.

    It is 240 - 54 = 186.


4.  "the mother is four years younger than the father":  M = F - 4.


5.  From n.3, M + F = 186.

    Substitute M = F - 4 from n.4.  You will get

    (F-4) + F = 186,

    2F - 4 = 186  ====>  2F = 190  ====>  F = {{{190/2}}} = 95 Years.


<U>Answer</U>. Father is 95 years old.
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My opinion is that this condition is absurd.  Nonsense, in other words.