Book Maths Puzzle

The present ages of A,B and C are in proportions 4 : 7 : 9. Eight years ago, the sum of their ages was 56. What are their present ages (in years)?

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Book Other Question

A is as much younger than B and he is older than C. If the sum of the ages of B and C is 50 years, what is definitely the difference between B and A's age? Ten years ago, P was half of Q in age. If the ratio of their present ages is 3:4, what will be the total of their present ages?