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In general, try to remember to keep your ratios in a form of 'this' to 'that' and 'this' to 'that'. For example,

3 apples : 6 Oranges; 2 apples: 4 oranges.

All ratios remain true regardless of which is on "top" (the numerator). It's only important to remain consistent and choose ratios that will be effective for the given problem.

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Q: How do you know how to set up a ratio?
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To solve this, set up the problem as a fraction: 60/90. Then reduce. The GCF of 60 and 90 is 30. Divide 30 into both 60 and 90 and you get a ratio of 2 to 3.