The family
How old is a mother if she is four times older than her daughter, and five years ago, she was even seven times older than her daughter? Today, a son is 30 years younger than a father. Seven years ago, a father was seven times older than a son. How old is a son today? How many years will a father be as old as his children together?
Correct answer:

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algebrabasic operations and conceptsUnits of physical quantitiesGrade of the word problem
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