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"A bookshelf contains science books and math books. The ratio of science books to math books is 2:3. There are 20 altogether. How many science books are there?" Ya so anyways I am kinda stumped on this question.

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So 2:3 of the 20 is science books, so you need to divide 20 into 3 groups and add up what 2 of the groups would be.

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Man, I hate ratios it's like the only thing I can't do. I hope there not on my test next week

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8 science books and 12 math books. i just did guess and check since 20 isn't that big of a number LOL xD so your answer is: Based on the given ratio and total number of books, there are 8 science books. :)

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Your lucky it's books (easier to see with whole numbers). Since there are 2 science books for every 3 math books there are a total of 5 books in each group. Given 20 books in all and 5 books per group there are (20 / 5) or 4 groups. So there are 8 science books and 12 math books on the bookshelf.

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