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In a certain family, the sum of the parents' ages is twice the sum of their children's ages. Five years ago, the sum of the parents' ages was four times the sum of the children's ages during that time. In fifteen years, the sum of the parents' ages will be equal to the sum of their children's ages. How many children are there in the family?
in Math by engr III (10.4k points) | 17 views

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