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225. How can you rub out 20 marks on a slate, have only five rubs,
and rub out every time an odd one?
226. From six take nine, from nine take ten,
From forty take fifty, and six will remain.
227. A man and his wife lived in wedlock, one-third of his age and
one-fourth of hers. Now, the man was eight years older than his wife
at marriage, and she survived him 20 years. How old were they when
married?