Pre International Mathematics Olympiad (IMO) Syllabus for class IX Students #shorts

In Class XI of a certain school, there are 30 students in a Mathematics class and 20 students in Biolog class. Find the number of students which are in Mathematics class or in Biology class in the following cases: (i) Two classes are conducted at the same time. (ii) Two classes are condcuted at different time and 5 students study both the subject

The percentage of marks obtained in Mathematics by a student of class 9 th in monthly unit tests is given below,