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April 17th, 2012, 01:57 AM  #1 
Member Joined: Apr 2012 Posts: 72 Thanks: 3  How many days?
During several days of observation on a weather station it was noticed that if it rained in the morning then the evening of the same day was clear, and if it rained in the evening then the morning of the same day was clear. During the period of observation there were 11 rainy days, and there were 8 clear evenings and 9 clear mornings. How many days did the observations last? 

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