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In 2000, Margaret was twice Charlie's age. In 2007, she was 7 years older than Charlie. How old is Charlie in 2011?

 Aug 30, 2022
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Let \(m\) be the age of Margaret in 2000, and let \(c \) be the age of Charlie in 2000.

 

From the first sentence, we know that \(2c = m\)

 

From the second sentence, we know that \(m + 7 = c + 7 + 7\), meaning \(m = c + 7\), so \(c = 7\) and \(m = 14\)

 

So, in 2011, Charlie was \(7 + 11 = \color{brown}\boxed{18}\)

 Aug 30, 2022

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