Word Problems in Ratio

In a classroom, the ratio of fiction books to non-fiction books is 7:4. If there are 28 fiction books, how many non-fiction books are there?

At an animal shelter, the ratio of dogs to cats is 3:2. If there are 18 dogs, how many cats are there?

In a donation drive, the ratio of notebooks to pens is 4:5. If there are 40 notebooks, how many pens are there?

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