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What is the correct answer?


The ages of Krish and Vaibhav are in the proportion of 3 : 5. After 9 years, the proportion of their ages will be 3 : 4. Then the current age of Vaibhav is

A. 13

B. 10

C. 18

D. 15

Please do not use chat terms. Example: avoid using "grt" instead of "great".