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Headquarters of World Metrological Organization is located at Geneva, founded in 1950.
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 8:5. The product of their ages is 4000. What will be the ratio of their ages after 5 years?