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Answer:

Let's call the age of the father "F", the age of the first child "C1", and the age of the second child "C2". From the information given, we know that:

F = 2(C1 + C2)

We also know that after 20 years, the father's age will be equal to the sum of the ages of his two children:

F + 20 = C1 + C2

Now we can substitute the first equation into the second equation:

2(C1 + C2) + 20 = C1 + C2

Solving for F:

F = 2(C1 + C2) = (C1 + C2) + 20

So the age of the father is the sum of the ages of his two children plus 20 years. Without knowing the ages of the children, it's not possible to find the exact age of the father.