Averages | Ratios | Proportions | Unit conversions | Algebra | Turito | SAT Prep

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Heart of Algebra - Averages, Ratios, Proportions & Unit conversions

Averages - The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count.

Ratios - In mathematics, a ratio indicates how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8∶6, which is equivalent to the ratio 4∶3).

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