The following piecharts show the distribution of students of graduate and postgraduate levels in seven different institutes in a town.
Distribution of students at graduate and postgraduate levels in seven institutes:
1. 
What is the total number of graduate and postgraduate level students is institute R? 


2. 
What is the ratio between the number of students studying at postgraduate and graduate levels respectively from institute S? 


3. 
How many students of institutes of M and S are studying at graduate level? 


4. 
What is the ratio between the number of students studying at postgraduate level from institutes S and the number of students studying at graduate level from institute Q? 


5. 
Total number of students studying at postgraduate level from institutes N and P is 

