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algebra intermediate

Problem

The owners of the Luray Caverns in Virginia conduct tours every 20 minutes. Each day in April the first tour is at 9 a.m., and the last tour starts at 6 p.m. How many tours are there per day in April?
Solution
From 9 a.m. to 6 p.m. there are 9 hours. In each hour, there are 3 tours (every 20 minutes). Thus, in 9 hours, there are tours. Don't forget to count the last tour at 6 p.m., so there are tours total per day.
Final answer
28