Ratio

Ratio is a comparison of two or more quantities of the same kind (in the same units). The ratio of one quantity to another expresses what fraction the first quantity is of the second.

If x and y are two quantities of the same kind, then the fraction is called the ratio of x and y. It is written as x:y. The quantities x and y are called the terms of the ratio, where x is called the first term or antecedent and y is called the second term or consequent.

Example

Suppose, Ram’s age is 15 years and his brother Govind’s age is 20 years, then the ratio of their ages is as follows:

This is written as,
Ram’s age : Govind’s age = 3:4
The symbol “:” stands for “is to”.