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how old is John?

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stablpuw | 10:28 Sat 02nd Jun 2007 | Quizzes & Puzzles
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When John is twice as old as he is now, he will be four times as old as he was six years ago. How old is John?
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He's 12
10:33 Sat 02nd Jun 2007
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My name is John, and I'm 60 !
14:05 Sat 02nd Jun 2007
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method (if you want it)

If his current age is X, then when he is twice as old his age will be 2X and six years ago it was (X-6).

We are told 2X = 4(X -6)

So X = 2(X - 6) or X = 2X - 12

Therefore 12 = 2X - X => X = 12
23:24 Sun 03rd Jun 2007

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