rule of three
rule of three articles on the Math Mental blog, with worked examples solved step by step.
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The rule of three: direct, inverse and compound proportion with examples
The rule of three solves problems with proportional quantities. If they are directly proportional, their ratio is constant; if inversely proportional, their product is constant. In a compound rule of three, the unknown equals the known value times one ratio per quantity, inverted when the relationship is inverse.
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