The term ratio has two numbers as numerator and denominator and it is represented in the form of p/q.
An example of ratio is a vegetable bowl has 12 lady fingers and 18 brinjals. So, the ratio of number of lady fingers to number of brinjals is 12/18 which in reduced form can be written as 2/3. Thus, for every 3 brinjals there are 2 lady fingers in the vegetable bowl.