Mathematics, 18.03.2020 02:25, holaadios222lol

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There are some books on three shelves. On the bottom shelf there are half as many books as on the other two shelves. On the middle shelf there are three times less than on the other two shelves. On the top shelf there are 30 books. How many books are on all three shelves?

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There are some books on three shelves. On the bottom shelf there are half as many...