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Like Answer
Ratio of boys to girls=7:5
Total no of students= 720
So, no of boys=(7/12)*720=420
No of girls=(5/12)*720=300
Now ratio of boys and girls will be 1:1 if no of girls become equals to no of boys.
So, (420-300)=120 no of girls to be admitted to make the ratio of boys and girls 1:1
Therefore, correct option is 120.
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