The ratio of the numbers of boys and girls in a school was 5 : 3. Some new boys

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The ratio of the numbers of boys and girls in a school was 5 : 3. Some new boys and girls were admitted to the school, in the ratio 5 : 7. At this, the total number of students in the school became 1200 and the ratio of boys to girls changed to 7 : 5. The number of students in the school before new admissions was = ?

Options:

A . 700

B . 720

C . 900

D . 960

Answer: Option D

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