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The sixth grade math problem: the application of ratio
1)

3:8

2)

3: 12

that is

1:4

3)

because

Number of science and technology books: number of story books = 8: 5

therefore

(Science and Technology Book-Storybook): Storybook = 3: 5

Because (science book-story book) =90.

therefore

Number of storybooks = 150

therefore

Number of science books =240