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IQ Quiz
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John is two years older than David who is twice as old as Charles. If the total of the ages of John, David and Charles be 27, the how old is David?

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If Charles is x years old, then David is 2x, and John is 2x + 2. 2x + 2 + 2x + x = 27; 5x = 25; x = 5. Charles is 5, so David is 10.

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