The average ages of parents and two children are 30 years and 8 years respectively. The average age of the family is
The sum of ages of parents = 30
         = $$30\times 2 = 60$$ (for mother father)
Sum of age of two children = $$8\times 2= 16$$ years
average = $$\frac{sum of four person}{4}$$
    = $$\frac{60+16}{4}$$ = 19 years
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