Write all proper fractions whose sum of numerator and denominator is 12.

The adjoining figure represents the preferences of the students during breakfast in a hostel mess. If the total number of students in the mess is 540, then with reference to the given figure, answer the following questions:

(i) What is the number of students who prefer coffee?

(ii) Whose number is greater, milk drinkers or orange juice drinkers and by what number?

(iii) What is the total number of students who drink mango shake or coffee? Is it equal to milk drinker?

(iv) Is the sum of all fractions in the given figure equal to 1?