Fun Session #!#Girls vs Boys

A school girl wants to join the Indian Air Force, but her peers and parents make fun of her. The cause of their making fun of the girl's aspiration is

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.

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?

A boy and a girl are playing in a park. The only daughter of the maternal grandfather of the girl, is the sister of the boy's father. How is the boy related to the girl ?

There are 30 boys and 20 girls in a class. The ratio of the number of girls to the number of boys is