Monday, January 9, 2012

Math problem, when will these two dreams happen like this again?

Elmo was having some bad dreams. Every 19 days he has a dream about witches. Every 13 days he has a dream about black cats. On Friday, April 5th he had the witches dream. The next night he had the cat dream. Do they ever occur on the same night by the end of the year? On what date?

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