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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.
Answer

Intial ratio of boys: girls= 7:5

Final ratio of boys: girls = 7:7 

Increase in number of girls= 7-5 =2 ( note that there is no change in number of boys)

In question  (7+5) ie. 12 corresponds to 720 

hence, 2 corresponds to {720/20}x 2= 120 (answer)

Answer

Answer: 

Total number of students =   720

Ratio of Boys to Girls=        7:5

Therfore number of boys =     (7/12)*720   =   420

Number of Girls    =              (5/12)*720   =   300

The ratio of Boys and Girls  will be 1:1 if the number of girls equal the number of boys.

At present number of girls less than that of boys=  420- 300  =120.

So 120 girls have to be admitted to make the ratio of boys and girls 1: 1

Hence Correct  option is   120

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