The school nurse must conduct lice checks at the elementary school. She must check 26 Kindergarteners, 19 first graders, 20 second graders, and 25 third graders. If each check takes 2 minutes, how many hours will it take the nurse to complete all the checks? Let's think first. Chain of thought:
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The school nurse must check a total of 26 Kindergarteners + 19 first graders + 20 second graders + 25 third graders = 90 students in all. If every check takes 2 minutes, it will take 90 students x 2 minutes = 180 minutes. There are 60 minutes in one hour, so it will take 180 minutes / 60 = 3 hours to complete the checks.
Therefore, the answer is 3.
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