GIRLS Vs BOYS COMPETITION

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,

In a class there are 12 boys and 7 girls. The teacher wants to select either a boy or a girl to represent the class in a competition. In how many ways can the teacher make this selection.

In a class tghere are 20 boys and 15 girls. In how many ways can the techer select one boy and one girl from amongst the students of the class to represent the schoo,l in a quiz competition?

In a chess competition involving some boys and girls of a school every student has to play exactly one game with every other student. It was found that in 45 games both the players were girls and in 190 games both were boys. The number of games in which one player was a boy and the other was a girl is

From a class of 12 girls and 15 boys, 12 students are to be chosen for a competition including 7 boys and 5 girls. The two girls and 3 boys who won the prizes last year should be included . In how many ways can the selection be made ?

In a class there are 30 boys and 18 girls. The teacher wants to select one boy and one girls. The teacher wants to select one boy and one girls to represent the class for a quliz competition. In how many ways can the teacher make this selection ?

In a chess competition involving some boys and girls of a school, every student had to play exactly one game with every other student. It was found that in 45 games both the players were girls and in 190 games both were boys. The number of games in which one player was a boy and the other was a girl is

A boy and a girl are facing each other. If the boy is standing at the North-West direction of the girl, in which direction is the girl to the boy?

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.