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April 17th, 2012, 01:57 AM   #1
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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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