Mathematics for IGCSE & O level - Ratio And Proportion (Section 3 - No. 20)
If a recipe calls for 2 eggs for every 3 cups of flour. How many eggs are needed if you use 9 cups of flour?
3
4
6
9
Explanation
2 eggs/3 cups flour. 9 cups flour = 3 * 3 cups, so, eggs = 2*3=6
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