The ratio of number of boys and girls in a school of 720 students is 7:5. How many girls are there in the school?
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Let numbers of boys =7x
Numbers of girls = 5x
Total students =7x+5x
ATQ 7x+5x=720
12x=720
x=720/12=60
So number of girls =5x =5×60 =300
So there are 300 girls in a school
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