Full Syllabus Quiz#!#Boys VS Girls

From a group of boys and girls,15 girls leave. There are then left 2 boys for each girl.After this,45 boys leave.There are then 5 girls for each boy.Find the number of girls in the beginning.

What is the number of students in the class ? I Ratio of boys and girls is 3 : 4 ii Girls are 18 more than boys,

Out of 8 outstanding students of school, in which there are 3 boys and 5 girls, a team of 4 students is to be selected for a quiz competition. Find the probability that 2 boys and 2 girls are selected.

In a class of 49 students, the ratio of girls to boys is 4:3. If 4 girls leave the class, the ratio of girls to boys would be