A ratio is a comparison of two quantities that describes how much of one thing there is compared to another. Ratios are commonly represented using colon notation or as fractions. They are read as the ratio of a to b, where b is a non-zero number.
The ratio a:b means that for every aunits of one quantity, there are b units of another quantity. Ratios can be part-to-part or part-to-whole.
Describes how two different groups are related
Describes the relationship between a specific group to a whole
The number of sophomores to freshmen on the basketball team is 7:15.
The number of sophomores to all basketball team members is 7:22.
The number of mangoes to jackfruits the vendor has is 10:20.
The number of mangoes to all fruits the vendor has is 10:42.
Ratios that express the same relationship between quantities are called equivalent ratios. For instance, consider the ratios of pages read per minute by Tearrik and by Zain.