SOLUTION: mike is three times as old as his little sister, Mary. in 4 years, he will be twice as old as Mary. how old is Mary?

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Question 1056683: mike is three times as old as his little sister, Mary. in 4 years, he will be twice as old as Mary. how old is Mary?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
mike is three times as old as his little sister, Mary. in 4 years, he will be twice as old as Mary. how old is Mary?
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4 years is the difference between 3x and 2x as old.
--> 12 & 4 now
16 & 8 in 4 years