5% expressed as a ratio = 1/20
Numbers that can be expressed as a ratio are called rational numbers.
Fractions
Certainly. Every fraction is a ratio.
No. If it is a ratio (as it is) then it has no units: it is a pure number.
A number that cannot be expressed as the ratio of two integers is known as an irrational number.
It is a ratio of two or more numbers, at least one of which is expressed in decimal form and none is expressed as a rational fraction.
Any number that can be expressed as the ratio of two integers is a rational number.
Probability is a measure of the likelihood of a given event and is a number in the range [0, 1]. That value, if expressed as a ratio, is a probability ratio. It can also be expressed as a percentage or a decimal fraction.
A rational number.
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The name given by engineers to the ratio of "electrical potential difference" (expressed in volts) to "rate of current flow" (expressed in amperes) is "resistance" (expressed in ohms).