Ratio
A ratio is a way to compare amounts of something. If you have 3 apples and 1 banana then the ratio of apples to bananas is 3 to 1. We write this as 3:1.
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The ratio of apples to bananas is 3:1.
Ratios can be written as fractions. 
Can you see how the ratio of bananas to apples gives the same information as the fractions.
75% of the fruit are apples.
0.75 of the fruit are apples.
The ratio of apples to bananas is 3:1.
These four statements are equivalent.
