3 new books and 8 used books what is the ratio

3:8

Step-by-step explanation:

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3:8

8:3

11:8

8:11

11:3

3:11

Step-by-step explanation:

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in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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