SOLUTION: Mary is sixteen years old and is 4 times as old as her brother. How old will Mary be when she is twice as old as her brother?

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Question 580683: Mary is sixteen years old and is 4 times as old as her brother. How old will Mary be when she is twice as old as her brother?
Answer by Alan3354(69443) About Me  (Show Source):
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Mary is sixteen years old and is 4 times as old as her brother. How old will Mary be when she is twice as old as her brother?
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She's 16, he's 4.
The difference is 12.
She'll be 2x when he's 12
She'll be 24.