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Recalling Ratios and Percentages

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Ratio means comparing two quantities. 
A basket has two types of fruits, say, 20 apples and 5 oranges. 

Then, the ratio of the number of oranges to the number of apples = 5 : 20.
The comparison can be done by using fractions as , `5/20 = 1/4`
The number of oranges is `1/4`th the number of apples. In terms of ratio, this is 1 : 4, read as, “1 is to 4”  OR 
Number of apples to number of oranges = `20/5 = 4/1` = which means, the number of apples is  4 times the number of oranges. This comparison can also be done using percentages.
There are 5 oranges out of 25 fruits. So percentage of oranges is `5/25 xx 4/4 = 20/100` = 20%  [Denominator made 100].   OR

By unitary method:   Out of 25 fruits, number of oranges are 5. So out of 100 fruits, number of oranges  `=5/25 xx 100 = 20 `
Since contains only apples and oranges , 

So, percentage of apples + percentage of oranges = 100 
or percentage of apples + 20 = 100 
or percentage of apples = 100 – 20 = 80 
Thus the basket has 20% oranges and 80% apples.

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