Study the following table carefully to answer the questions that follow.

What is the difference between the average number of students studying in College A over the given period and the average number of students studying in College C over the same period?

Study the following table carefully to answer the questions that follow.

What is the difference between the total number of students studying in College B over the given period and the total number of students studying in College D over the same period?

Study the following table carefully to answer the questions that follow.

The number of students studying in College C in the year 2010 is approximately what per cent of the total number of students studying in various colleges in that year?