4:5

4:5 is a ratio that represents the relationship between two quantities. In this case, it means that the first quantity is four units and the second quantity is five units.

For example, if the first quantity represents the number of boys in a class and the second quantity represents the number of girls, a ratio of 4:5 means that there are four boys for every five girls in the class.

Ratios can also be used to compare other types of quantities, such as lengths, weights, or amounts. The important thing to remember is that the ratio 4:5 indicates a comparison or relationship between the two quantities, with the first quantity being four units and the second quantity being five units.