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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what is to find out u didn't express...
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F equal to x1 + x 2 + x 3 + x 4
20 years after
2 into f + 20 equal to f + 80
Current age of father is 40
20 years after
2 into f + 20 equal to f + 80
Current age of father is 40
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