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In a school,the ratio of boys to girls is 9:4.If there are presently 720 girl students,how many more girls would it take to reduce the ratio of boys to girls to 2:1?

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720/4 = 180
so,
9:4 = 1620:720
Now, 1620 = 2*810
so, you need to add 810-720 = 90 girls

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