The ratio is used for comparing two quantities of the sane 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 in proportion.
The concept of ratio and proportion is majorly based on ratios and fractions.
Solution:
Given ratio, 
The reciprocal of the given ratio is 
Solution:
Given ratio, 
The reciprocal of the given ratio is 
Therefore, reciprocal of the ratio is 
