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Census
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Mr. and Mrs. Jorkins have fifteen children, all born at intervals of one year and a half. Miss Ada Jorkins, the eldest, had an objection to state her age to the census man, but she admitted that she was just seven times older than little Johnnie, the youngest of all.
What was Ada's age?
Do not too hastily assume that you have solved this little poser.
You may find that you have made a bad blunder!

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Math Genius