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(8) Thus the ratio of b to a is the inverse of the ratio of a to b. unclear like manner if c/d = a/b the ratio of c to d will be the inverse of the ratio of b to a. So in numbers, the ratio of 5 to 3 is the inverse of the ratio 3 to 5.

61. Hence a mutable, variable, or changeable quantity is said to be in the inverse ratio of another, when that is increased as this is diminished & vice versa. Thus, the time required ^ addition underline to finish a work /underline /addition will be inversely as the number of laborers. Thus also the same requisite unclear to a given distance will be inversely as the velocity on swiftness of the moving body. And therefore time is said to be inversely as velocity.

This consideration put arithmeticians