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Monica arrived in the Kangaroo Camp on July 25th in the morning and left the camp on August 3rd in the afternoon. How many nights did she sleep in the camp? 
Overseas Competition->Knowledge Point->Word Problem Modules->Periodic Problems->Periodic Problems of Time->Period of Dates
July has 31 days. She arrive on morning of July 25.  From July 25 to 31, there are 7 nights that she slept in the camp.  Then she slepft for 2 days in August, since she left on the afternoon Aug 3 already.  Hence, 2=7=9 