In a school there are 300 boys. The ratio of the number of boys to the number of girls is 5 : 7. Find the total number of students in the school.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 720
In the ratio 5 : 7 the boys are 5 parts and all the students are \(5+7=12\) parts. The number of boys gives the size of one part.
5 parts \(=300\), so 1 part \(=60\)
Girls \(=7\times60=420\)
Total \(=12\times60=720\)
There are 720 students in the school.