SOLUTION: During our vacation it rained on 13 days. Sometimes it rained in the morning, sometimes in the afternoon, but never at night. If it rained in the morning, the afternoon was clear.

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Question 175456: During our vacation it rained on 13 days. Sometimes it rained in the morning, sometimes in the afternoon, but never at night. If it rained in the morning, the afternoon was clear. If it rained in the afternoon, the preceding morning was clear. We had 11 clear mornings and 12 clear afternoons. How long was the vacation??
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
if we add all the clear units(1/2days) with all the rain units(1/2days) and divide by 2 we should get the number of vacation days.
:
highlight%28%2823%2B13%29%2F2=18%29days
:
:
            1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
            **************************************************
Morning     C C R C C R R C C  R  R  C  C  C  R  C  C  R
            **************************************************
afternoon   R C C R C C C R C  C  C  R  R  C  C  R  C  C
            **************************************************

C=clear
R=Rain