The ratio is used for comparing two quantities of the same kind.
The ratio formula for two numbers says a and b is given by a:b or a/b. When two or more such ratios are equal, they are said to be proportion.
The concept of ratio and proportion is majorly based on ratios and fractions.
(iii) 
Solution:
Given, 
Therefore, duplicate ratio
(iv) 
Solution:-
Given,
Therefore, duplicate ratio
