If the ratio of boys to girls in a school of 2400 children is 7:5, then find the number of boys in the school.
The ratio of girls to boys in a school is 5:3. If there are 300 girls, find the number of boys.
In a school the ratio of number of boys to number of girls is 9:7 .Find the number of boys and girls , if the total number of students is 3200 ?