A ratio compares two or more amounts of the same kind, written with a colon like 2 : 3. The order matters — 2 : 3 is not the same as 3 : 2. For example, if a class has 2 boys for every 3 girls, the ratio of boys to girls is 2 : 3, while girls to boys is 3 : 2. Always read carefully which amount is named first.
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