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Alpha Teach Yourself Algebra I in 24 Hours by Jane Cook

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Hour 13
Ratios and Proportions: Basic Percent Problems
You have been doing a lot of heavy lifting the past few hours, working with complex polynomials and lots of operations and fractions. Most of it has been leaning toward the theoretical side of the spectrum, with the focus on polynomial expressions and few real-life problems.
 
This hour you return to the real world and discover the many ways algebra can be helpful in comparing everything from student/teacher ratios at different schools to the percentage of sugar in different brands of breakfast cereal.

Setting Up and Simplifying Ratios to Solve Problems

Comparing two numbers often means knowing which is greater than the other, such as when you want to know if your favorite team won ...

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