How many students passed in first class?
I. 75% of the students who appeared in the examination have passed in first or second or third class.
II. 800 students have passed in third class.
III. The number of students who passed in second class is 60% of that in third class and the number of students who passed in first class is 55% of that in second class.
From II and III The number of students who passed in third class = 800 The number of students who passed in second class = 800 × 60/100 = 480 The number of students who passed in first class = 480 × 55/100 = 264 Hence, we can find the answer from only statement II and III.