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 TGIF (Posted on 2007-08-31)
Susan is so fond of Friday, the day of arrival of her favorite magazine, New Scientist, that she writes the date of every Friday of the year on a sheet of paper--just the ordinal date, so that, for example, the sheet for 2006 starts out: 6th, 13th, 20th, 27th, 3rd, ... .

She keeps these sheets in boxes by decade: one is labeled "the fifties"; another, "the sixties"; and so forth, through one she has labeled "the noughties".

She recently opened one of the earlier boxes and discovered the sheets were in tatters. Not only that, but the digits have all faded away. On one scrap, she found "rd nd" as consecutive entries. (The ordinal suffixes were presumably written in a hardier ink.) This did not enable her to work out precisely which dates these represented. But she did find within the same box, another, similar scrap showing two consecutive entries and was able to work out the precise dates to which they referred. What were those dates (including the year)?

 See The Solution Submitted by Charlie Rating: 4.0000 (5 votes)

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 re: Solution | Comment 2 of 5 |
(In reply to Solution by Penny)

The boxes were marked on the outside. Only digits have faded away. If Susan were in the Sixties box she would know from "rd nd" what year it was, as that was unique in that decade.
 Posted by Charlie on 2007-08-31 22:43:01

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