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9) There are 600 pupils in a school. The ratio of boys to girls in this school is 3:5. How many girls and how many boys are in this school? 10) Express the ratio 3 2 3: 7 1 3 in its simplest form. 11) There are r red marbles, b blue marbles and w white marbles in a bag. Write the ratio of the number of blue marbles to the total number of
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