Out of 65 students of class X, 40 are boys and 25 are girls.The class teacher wrote the serial numbers of all the students on separate cards and kept in a box in order to select a captain of the class. Then one of the cards is randomly taken out from the box. Find the probabilities of the class-captain being (i) a boy

Out of 65 students of class X, 40 are boys and 25 are girls.The class teacher wrote the serial numbers of all the students or separate cards and kept in a box in order to select a captain of the class. Then one of the cards is randomly taken out from the box. Find the probabilities of the class-captain being (ii) a girl.

In a school,students thought of planting tress in and around the school to reduce air pollution.It was decided that the number of trees that each section of each class will plant will be the same as the class in which they are studing e.g.a section of I class will plant 1 tree,a section of II class will plant 2 trees and so on,a section of XII class will plant 12 trees.There are three sections of each class. Find out how many trees were planted.

Form the pair of linear equations in the following problems,and find their solution graphically.(i)10 students of class X took part in a Mathematics quiz.If the number of girls is 4 more than the number of boys,find the number of boys and girls who took part in the quiz.

There are 102 students in a class. In an examination, 50 of them failed in Mathematics, 45 failed in Physics and 40 failed in Chemistry, 32 failed in exactly two of these three subjects. Only one student passed in all the three subjects. Find the number of students failing in all the three subjects.