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Present ages of ‘A’, ‘B’ and ‘C’ are in the ratio 7:8:9, respectively. If present average age of ‘A’ and ‘C’ is 32 years, then find the age of ‘B’ when ‘C’ was 21 years old?

A 10 years

B 15 years

C 17 years

D 18 years

E None of these

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