We can find unknown quantities when we know similar ratios for comparison, using proportions. We find proportions often in word problems, for example those involving baking ingredients, and in comparing similar figures in Geometry. We can represent an unknown quantity in a proportion with a variable, and then solve it using one-step, two-step, or multi-step equation methods.
Sample Problems (3)
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The ratio of the sale price of a shirt to the original price is 2:3. If the original price is $18, what's the sale price?