Ruby Garage second lesson
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In library each book order includes information about reader: name, order date, issue date. Write program that determines:
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the smallest period for which library found a book
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how many orders were not satisfied
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who often takes the book
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what is the most popular book
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how many people ordered one of the three most popular books.
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Describe the mail sorting (city, street, house, apartment, destination, value). Write a program that determines:
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the number of parcels sent to some city
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how many parcels with value higher than 10 were sent
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what is the most popular address