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B is 5 years older than A and A is 7 years older than C. If the sum of the age of A and C is 21 years, then find the sum of the ages of all three.
The ratio of A and B present age is 9:4. The product of their ages is 3600. What will be the ratio of their ages after 5 years?
Sum of the present ages of A, B, C and D is 60 years. After 6 years ratio of their ages is 6:5:5:4. What is C’s present age?