The age of a person and the number of teeth of a person vary or with each other.

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Detailed Solution

The age of a person and the number of teeth of a person vary directly or indirectly with each other.
We know that if two quantities

x

and

y

vary in the same way while maintaining a constant ratio between their respective values, then the two quantities are said to be in direct proportion.
i.e.

x y = k,

where k is a constant positive number.
The two variables

x and y

are said to be inversely proportional if and only if they are directly proportional to one another's reciprocal. If

x and y

are two variables in inverse variations, then

x ∝ 1 y ⇒ x = k 1 y ⇒ x = k y,        where k is proportianality constant ⇒ x y = k .... (1)

A person's teeth and age are two separate things. The relationship between a person's age and their specific tooth count is uncertain. Age and tooth count can differ from person to person. Therefore, age may sometimes vary either directly or inversely with respect to a person's teeth.
Hence, the age of a person and the number of teeth of a person vary directly or indirectly with each other.

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