The ages are 8 and 4
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Krishna is 12 and three times as old as his brother, who must be 4. In 4 years time when Krishna is 16 he will be twice as old as his brother, who will then be 8.
9 years
If Mike is 6 years old and twice as old as his brother, then his brother is 3 years old. When Mike is one and a half times his brother's age (1.5 * 3 = 4.5), he will be 4.5 years older than his brother. Therefore, Mike will be 6 + 4.5 = 10.5 years old when he is one and a half times his brother's age.
Mary will be 24 and her brother will be 12 !
John will be 16.