Direction: Read the following information carefully and answer the following questions. Statement I- There are 3 groups of students X, Y and Z and they study in different classes A, B and C. Number of students in class A is 120. 

Statement II- Number of students in class C is 80% of total number of students in class A and class B. Number of group X students in class A is 1/3rd of total number of students in class A. Total number of group X and group Y students in class B is 40. 

tatement III- Ratio of group Y and group Z students in class A is 3 : 1. Ratio of group X and group Y students in class B is 3 : 1. Total number of students in class B is 250% of total number of students of group X and group Y in class B. 

Statement IV- Ratio of group X, group Y and group Z students in class C is 3 : 5 : 3