A ratio is a mathematical expression of comparing two quantities by division.
It is written using ‘:’
For Example:- 5: 2.
Note: – The unit must be same to compare two quantities
If we multiply or divide both the numerator and denominator to the same number then we find the equivalent ratio.
For example:- , ,
The Lowest form of the Ratio:-
If there is no common factor of numerator and denominator except one then it is the lowest form of the ratio.
For eg – , , etc.
When we say that two ratios are equal then it is called Proportion.
It is written as a:b::b:c
If we find the value of one unit then calculate the value of the required number of units this is called the Unitary method.
If the cost of 4 books is 320 Rs. then what will be the cost of 8 books?
Cost of 3 books = Rs. 320
Cost of 1 book = = Rs. 80
Cost of 6 books = = Rs. 640