the age of father is equal to sum of ages of his 4 children . after 20 years sum of ages of the children will be twice of age of father
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the age of father is equal to sum of ages of his 4 children . after 20 years sum of ages of the children will be twice of age of father
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20 years after
2 into f + 20 equal to f + 80
Current age of father is 40