The ages of the 2nd and the 3rd sons are today in the ratio 10:9. The ages of the 1st and the
2
nd son 5 years from today will be in the ratio 13:12. The sum of the ages of all the three
sons 5 years from now will be 90. What are their ages today?
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Answer:
The son's and fatther's age make for 2 variables. We already have one equation from A. B and C can provide the other equation. Only 1 of them is required.
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