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12 - haesemathematics.com
Chapter 12. Ratio and proportion Contents: A Ratio B Writing ratios as fractions C Equal ratios D Proportions E Using ratios to divide quantities F Scale diagrams G Gradient or slope 100. 100. 100. 100. 50. 50. 50. 50. 0. 0. 0. 0. 25. 75. 95. 25. 75. 95. 25. 75. 95. 25. 75. 95. 5. 5. 5. 5. IB MYP_2. cyan magenta yellow black Y:\HAESE\IB_MYP2\IB_MYP2_12\ Tuesday, 12 August 2008 3:20:50 PM PETER. 234 RATIO AND PROPORTION (Chapter 12). A ratio is a comparison of quantities. We often hear statements about: a team's win-loss ratio the teacher-student ratio in a school the need to mix ingredients in a certain ratio or proportion: These are all examples of ratios. Ratios are also commonly used to indicate the scales on maps and scale diagrams. OPENING PROBLEMS. Problem 1: Two-stroke fuel for a motor-bike is made by mixing 1 part oil with 7 parts petrol. How much oil and petrol is needed to fill a 20 litre tank?
OPENING PROBLEMS 234 RATIO AND PROPORTION (Chapter 12) A ratio is a comparison of quantities. We often hear statements about: ² a team’s win-loss ratio ² the teacher-student ratio in a school ² the need to mix ingredients in a certain ratio or proportion:
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