Ratio
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A ratio between two quantities A and B is their fraction A/B. A ratio is a mathematical way of expressing the proportion of A to B. For example, if I bought 20 apples and have only 9 left, what is the proportion (or ratio) of 9 to 20? The answer is 9/20 or 0.45/1. The ratio may also be written as 0.45. Ratios can be changed into percentages, fractions and decimals. For example, the ratio "1:2" could be changed to the proportion "1 in every two", the fraction "1/2", the decimal "0.5", and the percentage "50%".
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