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

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
1). 700
2). 720
3). 900
4). 960

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