The ratio of number of boys and girls in a school...

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The ratio of number of boys and girls in a school 720 students is 7 : 5. How many more girls should be admitted to make the ratio 1 : 1 ?

A. 90

B. 120

C. 220

D. 240

Answer: Option B

Solution(By Examveda Team)

Number of a boy in the school = 720 × $$\frac{7}{12}$$ = 420
Number of a girl in the school = 720 × $$\frac{5}{12}$$ = 300
To maintain 1 : 1 we will have to add number of girls = 420 - 300 = 120

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