1) Easy: A recipe calls for 2 cups of flour and 1 cup of sugar. If you want to make half the recipe, how much flour and sugar will you need?
2) Normal difficulty: In a bag of marbles, the ratio of red to blue marbles is 3:5. If there are a total of 64 marbles in the bag, how many red marbles are there?
3) Difficult: The ratio of the number of boys to girls in a class is 5:7. If there are 36 students in the class, how many boys are there?
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