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Direct and Inverse Proportion What is a direct proportion?
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tỷ số và tỷ lệ 2in1
- How do you find the constant of proportionality? If a varies directly as b, and a = 24 when b = 8, find the constant of proportionality.
- Explain the practical significance of the miles per gallon unit rate. Percentages, Ratios, and Proportions
- Give examples of ratios used to measure environmental impact.
- Explain how to calculate the quantities of components in a mixture. A concrete mixture contains cement, sand, and gravel in the ratio 1 2 4. If 14 cubic meters of concrete are needed, how much of each ingredient is required?
- Explain how to find percentages from ratios. A price increased from $20 to $25. What is the percentage increase? Express this increase as a ratio of the original price to the increase.
- Explain the meaning of the ratio in this context. A metal alloy contains copper, zinc, and nickel in the ratio 5 3 2. If the weight of the alloy is 500 grams, find the weight of each metal.
- Convert the percentage to a fraction and then to a ratio.
- Give an example. How can ratios and proportions be used in problems involving taxation and discounts?
- Explain the method of solving mixture problems involving percentages. A gold alloy contains gold and copper in the ratio 7 3. If the weight of gold in the alloy is 21 grams, what is the weight of copper and the total weight of the alloy?
- Give an example. How can ratios and proportions be used in problems involving simple and compound interest?
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