From the condition, when Maria was 6 years old, Andrew was 12 years old.


So the difference between their ages is 6 years.


Hence, since Maria is 9 years now, Andrew's current age is 9+6 = 15 years.    ANSWER

Maria is now 9, so 3 years ago, she was 6

Since at that time, Andrew was twice her age, then at that time (3 years ago), Andrew was 2(6), or 12 years-old. 

Three years after (now), obviously, . 

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