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bobobalde111 | 07:55 Tue 13th Dec 2005 | Quizzes & Puzzles
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jack is twice as old as jill was when he was as old as she is now


if jack is four years older than jill, how old is jill ?

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Say Jill = x years and then Jack = x + 4 years


4 years ago he was as old as she is now


4 years ago Jill was x - 4


So, Jack now = twice what Jill was 4 years ago


ie x + 4 = 2(x - 4)


ie x + 4 = 2x - 8


ie x = 12, which is Jill's age

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