Advantages :
(i) This is very simple method which is understood even by a common man.
(ii) It requires little time to express this scale.
(iii) It gives correct idea about distance.
Disadvantages :
(i) It can be understood only by those who are familiar with the unit of measurement used. For example, if we say that the scale of a map is 1 cm : 1 km, it would be understood by only that person who is familiar with the metric system of measurement.
(ii) When a map is reduced or enlarged from the original, the scale does not remain the same. This creates problems in measurement.
What is Representative Fraction ? Give its advantages and disadvantages.